Mixed Statesmixedstates.somethingsimilar.com/aggregates/xml/1/atom2006-12-04T10:20:42ZAll material copyright their owners.Mixed<![CDATA[Marni Dee Sheppeard: The Dark Side]]>http://kea-monad.blogspot.com/2008/03/dark-side.html2008-03-15T03:30:01ZMarni Dee Sheppeard I'm a bit behind the times down here sometimes. I only just noticed, whilst passing the news stand at the supermarket, that the cover story of the last issue of New Scientist is about the possible non-existence of The Dark Force. I didn't need to open it to know that it mentioned David Wiltshire, but of course not Louise Riofrio, Matti Pitkanen or a whole of host of other quantum gravity researchers who think The Dark Force is absurd.]]> I'm a bit behind the times down here sometimes. I only just noticed, whilst passing the news stand at the supermarket, that the cover story of the last issue of New Scientist is about the possible non-existence of The Dark Force. I didn't need to open it to know that it mentioned David Wiltshire, but of course not Louise Riofrio, Matti Pitkanen or a whole of host of other quantum gravity researchers who think The Dark Force is absurd.]]><![CDATA[Doug Natelson: March APS Meeting III]]>http://nanoscale.blogspot.com/2008/03/march-meeting-iii.html2008-03-15T02:29:58ZDoug NatelsonDay 3 in New Orleans continued to be interesting, though I missed some talks so that I could have conversations with a few people, including my program officers from a couple of funding agencies. It's never a bad idea to make sure that the program officers know what you've been doing with their resources.

I started out the day by catching an invited talk by Doug Scalapino talking about his take on the binding "glue" in the high-Tc superconductors. Scalapino uses "glue" to refer to the retarded (time-delayed) interaction that leads to pairing of the electrons. In the low temperature superconductors, the glue in this sense is the retarded phonon interaction - in a sense, one electron leaves behind a lattice vibration that slightly deforms the ion charge distribution, leading to a second electron of opposite momentum to feel a slight residual attraction to the first electron. The screened Coulomb interaction between the electrons is effectively instantaneous (and repulsive). In the high-Tc case, it's not clear what the glue is. Scalapino would argue that it's a spin fluctuation interaction; Phil Anderson would probably argue that there is no important glue in this sense of the term.

I then chaired my session, which was fun but tiring. One particularly cute experiment was from the Weig/Kotthaus group at Munich. They are trying to use nanomechanical resonators as charge shuttles. The idea is a bit like a bucket brigade. Have a metal island be suspended on a resonant beam between a source and a drain electrode. When set up ideally and driven at resonance, the island will swing back and forth between the source and drain like the clapper between the bells of an old alarm clock. When the island gets close to the source, an electron can tunnel onto the island. Ideally Coulomb blockade would ensure that it's one and only one electron. Then the island can swing over to the drain electrode, and drop off that electron. The experiment was elegant - they make many resonators at once and wire them all up in parallel. The clever bit is that they have each resonator tailored with a different mass, so that they can selectively drive just the one that they want. They drive mechanically, by shaking the whole chip back and forth, to avoid electrical crosstalk trouble. It should be very nice when they can get the structures even smaller and colder, to see strong Coulomb blockade effects.
]]>
Day 3 in New Orleans continued to be interesting, though I missed some talks so that I could have conversations with a few people, including my program officers from a couple of funding agencies. It's never a bad idea to make sure that the program officers know what you've been doing with their resources.

I started out the day by catching an invited talk by Doug Scalapino talking about his take on the binding "glue" in the high-Tc superconductors. Scalapino uses "glue" to refer to the retarded (time-delayed) interaction that leads to pairing of the electrons. In the low temperature superconductors, the glue in this sense is the retarded phonon interaction - in a sense, one electron leaves behind a lattice vibration that slightly deforms the ion charge distribution, leading to a second electron of opposite momentum to feel a slight residual attraction to the first electron. The screened Coulomb interaction between the electrons is effectively instantaneous (and repulsive). In the high-Tc case, it's not clear what the glue is. Scalapino would argue that it's a spin fluctuation interaction; Phil Anderson would probably argue that there is no important glue in this sense of the term.

I then chaired my session, which was fun but tiring. One particularly cute experiment was from the Weig/Kotthaus group at Munich. They are trying to use nanomechanical resonators as charge shuttles. The idea is a bit like a bucket brigade. Have a metal island be suspended on a resonant beam between a source and a drain electrode. When set up ideally and driven at resonance, the island will swing back and forth between the source and drain like the clapper between the bells of an old alarm clock. When the island gets close to the source, an electron can tunnel onto the island. Ideally Coulomb blockade would ensure that it's one and only one electron. Then the island can swing over to the drain electrode, and drop off that electron. The experiment was elegant - they make many resonators at once and wire them all up in parallel. The clever bit is that they have each resonator tailored with a different mass, so that they can selectively drive just the one that they want. They drive mechanically, by shaking the whole chip back and forth, to avoid electrical crosstalk trouble. It should be very nice when they can get the structures even smaller and colder, to see strong Coulomb blockade effects.
]]>
<![CDATA[Doug Natelson: March APS Meeting wrapup]]>http://nanoscale.blogspot.com/2008/03/march-aps-meeting-wrapup.html2008-03-15T02:29:33ZDoug NatelsonI returned yesterday evening from the March Meeting, and spent much of today helping out with our graduate recruiting weekend for both my department and the applied physics graduate program. Hence the delayed blogging.

My last day at the March Meeting was spent largely flitting from session to session. I saw a very nice pair of talks by David Cobden and one of his students from Washington, showing measurements of the metal-insulator transition in VO2 nano-beams. Vanadium dioxide is allegedly a Mott insulator in its low temperature state, meaning that the on-site repulsion of the d orbitals of the vanadium is so strong and the electronic population is just right so that the whole correlated system is frozen. A bit above room temperature (around 65 C) VO2 becomes metallic, and there's been a lot of interest in understanding the transition, which is accompanied by a lattice distortion. In the new work, suspended beams of the oxide are observed in an optical microscope while the transition is examined. There is optical contrast between the two phases, so one can determine how much of the beam is in each phase in the coexistence region. Moreover, the elastic properties of the beam allow them to infer much information about the phase diagram for the transition, and offer some hints in conjunction with conductance measurements that the metal/insulator transition may be separate from the structural transition.

After this, I went off to the session on charge and orbital ordering to give my own talk about our magnetite results. Then I headed over to a session on molecular electronics. Finally, I ended up over near a focus session on nanotechnology, where there were a couple of nice talks on fabrication methods.

Overall, it was a good meeting - as good as these things usually are. Most of the talks that I saw were pretty decent, and I had some useful conversations with lots of colleagues. Only once or twice did it occur to me that sessions could be more pleasant if someone replaced the usual oven timer for pacing talks with either a giant gong or perhaps one of those big hooks used to pull people off stage in bad vaudeville skits.

]]>
I returned yesterday evening from the March Meeting, and spent much of today helping out with our graduate recruiting weekend for both my department and the applied physics graduate program. Hence the delayed blogging.

My last day at the March Meeting was spent largely flitting from session to session. I saw a very nice pair of talks by David Cobden and one of his students from Washington, showing measurements of the metal-insulator transition in VO2 nano-beams. Vanadium dioxide is allegedly a Mott insulator in its low temperature state, meaning that the on-site repulsion of the d orbitals of the vanadium is so strong and the electronic population is just right so that the whole correlated system is frozen. A bit above room temperature (around 65 C) VO2 becomes metallic, and there's been a lot of interest in understanding the transition, which is accompanied by a lattice distortion. In the new work, suspended beams of the oxide are observed in an optical microscope while the transition is examined. There is optical contrast between the two phases, so one can determine how much of the beam is in each phase in the coexistence region. Moreover, the elastic properties of the beam allow them to infer much information about the phase diagram for the transition, and offer some hints in conjunction with conductance measurements that the metal/insulator transition may be separate from the structural transition.

After this, I went off to the session on charge and orbital ordering to give my own talk about our magnetite results. Then I headed over to a session on molecular electronics. Finally, I ended up over near a focus session on nanotechnology, where there were a couple of nice talks on fabrication methods.

Overall, it was a good meeting - as good as these things usually are. Most of the talks that I saw were pretty decent, and I had some useful conversations with lots of colleagues. Only once or twice did it occur to me that sessions could be more pleasant if someone replaced the usual oven timer for pacing talks with either a giant gong or perhaps one of those big hooks used to pull people off stage in bad vaudeville skits.

]]>
<![CDATA[Backreaction Group Blog: Historical Meme: Seven Things about Richard Carrington]]>http://backreaction.blogspot.com/2008/03/historical-meme-seven-things-about.html2008-03-15T00:09:31ZBackreaction Group Blog Tommaso Dorigo has tagged us with one of those blog memes - in this case, a variant of the Historical Meme. The idea is to

  • link to the person who tagged you,
  • list seven random or weird things about your favourite historical figure,
  • tag seven more people at the end of your blog and link to theirs,
  • let the tagged people know by leaving a note on their site.


In backreaction's editorial office, history-related stuff ends up on my desk, so I'll try my best to keep the meme alive. Actually, I do not have a favourite historical figure - there are just way too many -, so I'll specify seven small facts about an interesting historical figure I've just been reading about, Richard Carrington (the Wikipedia entry is still quite brief...)


  • Richard Carrington was born in 1826 in Chelsea, England. He studied at Cambridge to become a cleric, but discovered his fascination for astronomy

  • His father, a wealthy brewer, agreed that he constructed his own, private observatory at Redhill, Surrey. Working there, Carrington established an accurate Catalogue of Stars of the Northern Sky, which won him the Gold Medal of the Royal Astronomical Society in 1859.


    A series of large sunspots in March 2001 (Credit: SOHO)

  • During daytime, he didn't rest, but embarked on a long-term systematic study of sunspots. Analysing his data, he discovered the differential rotation of the Sun, implying that the Sun could not be a solid, rigid body, as current wisdom stated at that time.


    A Solar Filament Lifts Off (Credit: TRACE, NASA, via APOD, July 25, 2004)

  • While making his daily observations of sunspots, he became, on September 1, 1859, the lucky eyewitness of one of the largest solar flares in the last few hundred years. A solar flare is a huge explosion in the Sun's atmosphere, when turbulent magnetic fields slingshot large amounts of ionised gas into interstellar space. When this plasma hits the Earth's magnetic field, a few hours after the flare, the result is a "Geomagnetic Storm", which can affect power grids, electronic equipment - and causes splendid auroras. In the wake of Carrington's flare, spectacular auroras could be observed up to about ±30° latitude.


    The Aurora Borealis above Bear Lake, Alaska (Credit: Wikipedia)

  • Following the death of his father, he took care of the brewery. He tried to keep on his solar observation program, and his activities as a secretary for the Royal Astronomical Society. But to his growing frustration, he had to note that he could not manage both the brewery and his strict observational schedule at the same time. He even sold his observatory.

  • In the hope to be able to follow his fascination for astronomy full-time again, he tried to get the positions of the director of the university observatories of Cambridge and Oxford when they had job openings, but without success. Finally, he brought himself to sell the brewery, established a new private observatory and tried to tie in with his earlier work, but with not much success.

  • His wife was stabbed by a former lover, and had to take strong medication in the aftermath. She died from an overdose of sedatives. Carrington died ten days later, on November 27, 1875, officially of a brain haemorrhage.


I've learned all these things from a very readable book with a somewhat silly title, The Sun Kings: The Unexpected Tragedy of Richard Carrington and the Tale of How Modern Astronomy Began, by Stuart Clark. It's not only about Carrington, but about how during the 19th century, the study of the Earth's magnetic field, the observation of sunspots, and the developments of spectroscopy and atomic theory started astrophysics and our understanding of the Sun and the stars - here is a review.

OK - Sabine was quite reluctant to propagate the meme, because it may just annoy the affected bloggers who could feel compelled to waste their time contributing something. So, I'll introduce a mutation and transmit it to five blogs only instead of seven, and allow for a crossing of the language barrier. Here are the tags: What is Einstein's Moon?, Text&Blog, Highly Allochthonous, The Greenbelt, and Theorema Egregium.




Update (March 14):
Here is a brief genealogy of the meme, as reconstructed by the links:


There is an essential mutation of the meme at Magistra et Mater, changing "word 2" from "Share seve random and/or weird things about yourself" to "about a historical figure of your choice". So, I consider that post the starting point of this meme. The minor change from "of your choice" to "favourite" happened already at Heavenfield, who also gives a partial account of the early path of the meme.

I have tagged The Greenbelt, who had in fact already been tagged before - and, as it happens, together with Chris at Highly Allochthonous - along this line:

Nevertheless, The Greenbelt had a short dead time (my tribute to Talk like a Physicist Day) and agreed to participate once more. So, until I will have figured out how trackbacks work, here are links to the meme's next generation so far:



]]>
Tommaso Dorigo has tagged us with one of those blog memes - in this case, a variant of the Historical Meme. The idea is to

  • link to the person who tagged you,
  • list seven random or weird things about your favourite historical figure,
  • tag seven more people at the end of your blog and link to theirs,
  • let the tagged people know by leaving a note on their site.


In backreaction's editorial office, history-related stuff ends up on my desk, so I'll try my best to keep the meme alive. Actually, I do not have a favourite historical figure - there are just way too many -, so I'll specify seven small facts about an interesting historical figure I've just been reading about, Richard Carrington (the Wikipedia entry is still quite brief...)


  • Richard Carrington was born in 1826 in Chelsea, England. He studied at Cambridge to become a cleric, but discovered his fascination for astronomy

  • His father, a wealthy brewer, agreed that he constructed his own, private observatory at Redhill, Surrey. Working there, Carrington established an accurate Catalogue of Stars of the Northern Sky, which won him the Gold Medal of the Royal Astronomical Society in 1859.


    A series of large sunspots in March 2001 (Credit: SOHO)

  • During daytime, he didn't rest, but embarked on a long-term systematic study of sunspots. Analysing his data, he discovered the differential rotation of the Sun, implying that the Sun could not be a solid, rigid body, as current wisdom stated at that time.


    A Solar Filament Lifts Off (Credit: TRACE, NASA, via APOD, July 25, 2004)

  • While making his daily observations of sunspots, he became, on September 1, 1859, the lucky eyewitness of one of the largest solar flares in the last few hundred years. A solar flare is a huge explosion in the Sun's atmosphere, when turbulent magnetic fields slingshot large amounts of ionised gas into interstellar space. When this plasma hits the Earth's magnetic field, a few hours after the flare, the result is a "Geomagnetic Storm", which can affect power grids, electronic equipment - and causes splendid auroras. In the wake of Carrington's flare, spectacular auroras could be observed up to about ±30° latitude.


    The Aurora Borealis above Bear Lake, Alaska (Credit: Wikipedia)

  • Following the death of his father, he took care of the brewery. He tried to keep on his solar observation program, and his activities as a secretary for the Royal Astronomical Society. But to his growing frustration, he had to note that he could not manage both the brewery and his strict observational schedule at the same time. He even sold his observatory.

  • In the hope to be able to follow his fascination for astronomy full-time again, he tried to get the positions of the director of the university observatories of Cambridge and Oxford when they had job openings, but without success. Finally, he brought himself to sell the brewery, established a new private observatory and tried to tie in with his earlier work, but with not much success.

  • His wife was stabbed by a former lover, and had to take strong medication in the aftermath. She died from an overdose of sedatives. Carrington died ten days later, on November 27, 1875, officially of a brain haemorrhage.


I've learned all these things from a very readable book with a somewhat silly title, The Sun Kings: The Unexpected Tragedy of Richard Carrington and the Tale of How Modern Astronomy Began, by Stuart Clark. It's not only about Carrington, but about how during the 19th century, the study of the Earth's magnetic field, the observation of sunspots, and the developments of spectroscopy and atomic theory started astrophysics and our understanding of the Sun and the stars - here is a review.

OK - Sabine was quite reluctant to propagate the meme, because it may just annoy the affected bloggers who could feel compelled to waste their time contributing something. So, I'll introduce a mutation and transmit it to five blogs only instead of seven, and allow for a crossing of the language barrier. Here are the tags: What is Einstein's Moon?, Text&Blog, Highly Allochthonous, The Greenbelt, and Theorema Egregium.




Update (March 14):
Here is a brief genealogy of the meme, as reconstructed by the links:


There is an essential mutation of the meme at Magistra et Mater, changing "word 2" from "Share seve random and/or weird things about yourself" to "about a historical figure of your choice". So, I consider that post the starting point of this meme. The minor change from "of your choice" to "favourite" happened already at Heavenfield, who also gives a partial account of the early path of the meme.

I have tagged The Greenbelt, who had in fact already been tagged before - and, as it happens, together with Chris at Highly Allochthonous - along this line:

Nevertheless, The Greenbelt had a short dead time (my tribute to Talk like a Physicist Day) and agreed to participate once more. So, until I will have figured out how trackbacks work, here are links to the meme's next generation so far:



]]>
<![CDATA[Peter Steinberg: Movie Physics Report Card]]>http://entropybound.blogspot.com/2008/03/movie-physics-report-card.html2008-03-14T23:37:26ZPeter Steinberg ]]> ]]><![CDATA[Cosma Shalizi: Profiled]]>http://bactra.org/weblog/564.html2008-03-14T20:38:06ZCosma ShaliziI am this week's profilee at Norman Geras's blog. This is very pleasing to me, as my chance discovery of Norm's Solidarity in the Conversation of Human Kind (followed by his Marx and Human Nature) was an important part of my intellectual development in graduate school. There are some very important areas of politics where I believe that he is very wrong, but he's always sincerely benevolent and worth reading; and sometimes, simply right.

Self-Centered; The Progressive Forces; Linkage

]]>
I am this week's profilee at Norman Geras's blog. This is very pleasing to me, as my chance discovery of Norm's Solidarity in the Conversation of Human Kind (followed by his Marx and Human Nature) was an important part of my intellectual development in graduate school. There are some very important areas of politics where I believe that he is very wrong, but he's always sincerely benevolent and worth reading; and sometimes, simply right.

Self-Centered; The Progressive Forces; Linkage

]]>
<![CDATA[Luboš Motl: Paris]]>http://motls.blogspot.com/2008/03/paris.html2008-03-14T19:23:51ZLuboš Motl<![CDATA[Peter Steinberg: Talk Like A Physicist Day, but not on Wikipedia]]>http://entropybound.blogspot.com/2008/03/talk-like-physicist-day-but-not-on.html2008-03-14T18:20:41ZPeter SteinbergTalk Like A Physicist Day", held today on "Pi" 2008 (i.e. 3/14/2008). While I feel like I talk like a physicist every day (or every once in a while on this blog), maybe I could consider a few of their suggestions:
Don’t say that “you are going to brush your teeth”; instead “I am going to apply the force of friction to overcome the electrical bonds between my teeth and foreign matter.”
Ahem, my wife won't appreciate that one.
That said, I hadn't realized how restrictive it is to speak about one's own work, once submitted to a prestigious journal. As New Scientist reports (via Slashdot):
Scientists who want to describe their work on Wikipedia should not be forced to give up the kudos of a respected journal. So says a group of physicist who are going head-to-head with a publisher because it will not allow them to post parts of their work to the online encylopaedia, blogs and other forums.

The physicists were upset after the American Physical Society withdrew its offer to publish two studies in Physical Review Letters because the authors had asked for a rights agreement compatible with Wikipedia . The APS asks ascientists to trasnfer their copyright to the sccoiety before they can publish in an APS journal. This prevents scientists contributing illustrations or other "derivative works" of their papers to many websites without explicit permission.

So, for now, feel free to talk like a physicst, but just not on Wikipedia. Let's see what happens in May.
]]>
Talk Like A Physicist Day", held today on "Pi" 2008 (i.e. 3/14/2008). While I feel like I talk like a physicist every day (or every once in a while on this blog), maybe I could consider a few of their suggestions:
Don’t say that “you are going to brush your teeth”; instead “I am going to apply the force of friction to overcome the electrical bonds between my teeth and foreign matter.”
Ahem, my wife won't appreciate that one.
That said, I hadn't realized how restrictive it is to speak about one's own work, once submitted to a prestigious journal. As New Scientist reports (via Slashdot):
Scientists who want to describe their work on Wikipedia should not be forced to give up the kudos of a respected journal. So says a group of physicist who are going head-to-head with a publisher because it will not allow them to post parts of their work to the online encylopaedia, blogs and other forums.

The physicists were upset after the American Physical Society withdrew its offer to publish two studies in Physical Review Letters because the authors had asked for a rights agreement compatible with Wikipedia . The APS asks ascientists to trasnfer their copyright to the sccoiety before they can publish in an APS journal. This prevents scientists contributing illustrations or other "derivative works" of their papers to many websites without explicit permission.

So, for now, feel free to talk like a physicst, but just not on Wikipedia. Let's see what happens in May.
]]>
<![CDATA[Chad Orzel: FutureBaby Playlist: O-S]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/251492867/futurebaby_playlist_os.php2008-03-14T17:17:53ZChad OrzelYou know, there are really a remarkable number of bands whose names begin with "S"... There may be more "B" or "T" acts in my library, just because I own a bazillion songs by Bob Dylan and Tom Waits, but there sure are a lot of "S" artists.

This set continues to show that sing-along-ability is the most important criterion in picking FutureBaby tunes. On strict moral grounds, the Pogues have no business on such a list, not due to lyrical content, but rather the make-up of the band, but how could I not include a couple of theirs?

Read the rest of this post... | Read the comments on this post...]]>
You know, there are really a remarkable number of bands whose names begin with "S"... There may be more "B" or "T" acts in my library, just because I own a bazillion songs by Bob Dylan and Tom Waits, but there sure are a lot of "S" artists.

This set continues to show that sing-along-ability is the most important criterion in picking FutureBaby tunes. On strict moral grounds, the Pogues have no business on such a list, not due to lyrical content, but rather the make-up of the band, but how could I not include a couple of theirs?

Read the rest of this post... | Read the comments on this post...]]>
<![CDATA[Backreaction Group Blog: PI day Captcha]]>http://backreaction.blogspot.com/2008/03/pi-day-captcha.html2008-03-14T17:06:20ZBackreaction Group Blog


From Quantum Random Bit Generator Service via mathlog and wiskundemeisjes.



Captcha: "Completely Automated Public Turing test to tell Computers and Humans Apart".

PI Day, recycled.

]]>



From Quantum Random Bit Generator Service via mathlog and wiskundemeisjes.



Captcha: "Completely Automated Public Turing test to tell Computers and Humans Apart".

PI Day, recycled.

]]>
<![CDATA[Chad Orzel: Lab Visit Report: Four-Wave Mixing]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/251445209/lab_visit_report_fourwave_mixi.php2008-03-14T15:54:43ZChad OrzelResearchBlogging.orgThe next lab visit experiments I want to talk about are really the epitome of what I called the "NIST Paradigm" in an earlier post. These are experiments on "four-wave mixing" done by Colin McCormick (who I TA'd in freshman physics, back in the day), a post-doc in Paul Lett's lab at NIST. As Paul said when I visited, if they had had a better idea of the field they were dabbling in, they would've thought that what they were trying was impossible; thanks to their relative ignorance, though, they just plowed ahead, and accomplished something pretty impressive.

The basic scheme is laid out in this arXiv preprint, which appears to be the same as this Optics Letter (I don't have electronic access to Optics Letters, so I'm working off the arXiv text), and looks like this:

4wm.jpg

Clears everything right up, doesn't it? Well, OK, maybe I can explain a little more...

Read the rest of this post... | Read the comments on this post...]]>
ResearchBlogging.orgThe next lab visit experiments I want to talk about are really the epitome of what I called the "NIST Paradigm" in an earlier post. These are experiments on "four-wave mixing" done by Colin McCormick (who I TA'd in freshman physics, back in the day), a post-doc in Paul Lett's lab at NIST. As Paul said when I visited, if they had had a better idea of the field they were dabbling in, they would've thought that what they were trying was impossible; thanks to their relative ignorance, though, they just plowed ahead, and accomplished something pretty impressive.

The basic scheme is laid out in this arXiv preprint, which appears to be the same as this Optics Letter (I don't have electronic access to Optics Letters, so I'm working off the arXiv text), and looks like this:

4wm.jpg

Clears everything right up, doesn't it? Well, OK, maybe I can explain a little more...

Read the rest of this post... | Read the comments on this post...]]>
<![CDATA[Chad Orzel: Nice Beaver!]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/251397411/nice_beaver.php2008-03-14T14:11:00ZChad Orzelsm_beaver_beg.jpg

Yet another picture taken by Kate at the National Zoo. When we arrived at the beaver pen, a bunch of keepers were inside, posing for a picture. This little guy clearly thought that humans being in his enclosure indicated that it was feeding time, and was doing his best pathetic begging.

It really just begs to be LOL'ed:

Read the rest of this post... | Read the comments on this post...]]>
sm_beaver_beg.jpg

Yet another picture taken by Kate at the National Zoo. When we arrived at the beaver pen, a bunch of keepers were inside, posing for a picture. This little guy clearly thought that humans being in his enclosure indicated that it was feeding time, and was doing his best pathetic begging.

It really just begs to be LOL'ed:

Read the rest of this post... | Read the comments on this post...]]>
<![CDATA[Chad Orzel: Talk Like a Physicist]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/251346240/talk_like_a_physicist.php2008-03-14T12:23:53ZChad OrzelToday ha been dubbed "Talk Like a Physicist Day". Why? Because we're at least as cool as pirates, that's why.

Over at Swans on Tea, Tom offers some vocabulary tips:

Use "canonical" when you mean "usual" or "standard." As in, "the canonical example of talking like a physicist is to use the word 'canonical.'"

Use "orthogonal" to refer to things that are mutually-exclusive or can't coincide. "We keep playing phone tag -- I think our schedules must be orthogonal"

"About" becomes "to a first-order approximation"

Things are not difficult, they are "non-trivial"

Large discrepancies are "orders of magnitude apart"

Other suggestions: a situation isn't "bad," it's "sub-optimal." "Finite" can mean either "really big, but not infinite," or "really small, but not zero." If you really want to sound advanced, something that moves from one state to another slowly-- say, a highway driver who takes a mile and a half to move from one lane into the other-- does so "adiabatically."

I know I'm missing some obvious verbal tics. Leave your suggestions in the comments.

Read the comments on this post...]]>
Today ha been dubbed "Talk Like a Physicist Day". Why? Because we're at least as cool as pirates, that's why.

Over at Swans on Tea, Tom offers some vocabulary tips:

Use "canonical" when you mean "usual" or "standard." As in, "the canonical example of talking like a physicist is to use the word 'canonical.'"

Use "orthogonal" to refer to things that are mutually-exclusive or can't coincide. "We keep playing phone tag -- I think our schedules must be orthogonal"

"About" becomes "to a first-order approximation"

Things are not difficult, they are "non-trivial"

Large discrepancies are "orders of magnitude apart"

Other suggestions: a situation isn't "bad," it's "sub-optimal." "Finite" can mean either "really big, but not infinite," or "really small, but not zero." If you really want to sound advanced, something that moves from one state to another slowly-- say, a highway driver who takes a mile and a half to move from one lane into the other-- does so "adiabatically."

I know I'm missing some obvious verbal tics. Leave your suggestions in the comments.

Read the comments on this post...]]>
<![CDATA[Michael Nielsen: Biweekly links for 03/14/2008]]>http://feeds.feedburner.com/~r/michaelnielsen/wmna/~3/251323487/2008-03-14T10:53:06ZMichael Nielsen
  • Google Search: “chief ontologist” OR “chief ontology officer”
    • If I had a time machine, I’d go back and tell my high school careers counsellor that I wanted to be a Chief Ontology Officer when I grew up.
  • One Big Lab: Online collaborative manuscript annotation
    • shwu wants tools for online collaborative manuscript annotation. Anyone want to help her out? The Django book project and crit.org (now defunct, see the wayback machine) immediately come to mind.
  • Yutaka Shikano on SciBarCamp
  • TimothyPilgrim on SciBarCamp
  • Org tutorials
    • I used to use Word to jot down my thoughts, and as an outlining tool. Most of my writing, though, is done in emacs. I’ve recently started using org mode for emacs, and am thinking it might be time to make the switch completely.
  • What You’re Doing Is Rather Desperate: Rewards, output and academia
    • “The Nature Biotechnology article is recognised by academia and qualifies for academic rewards. The blog posts - which are longer, more detailed, written by enthusiastic communicators and in theory, accessible to a much wider audience … are not.”
  • Marginal Revolution: Cooked books
    • Tyler Cowen: “If I had to guess whether Wikipedia or the median refereed journal article on economics was more likely to be true, after a not so long think I would opt for Wikipedia. This comparison should give us pause.” Ouch. And wow.
  • clapclap.org: Hallelujah
    • The history of Leonard Cohen’s song.
  • Relativistic asteroids
  • Tiny projects keep it new - (37signals)
    • “Shatter big projects into little pieces… Working on, finishing, and launching one little piece at a time will help you stay motivated because you’re always working on something new”
  • Word of the week: Rebbe
    • Rebbe is a Yiddish term which means master, teacher, or mentor, mostly referring to the leader of a Hassidic Jewish movement. Compare to the Hebrew “Rabbi”
  • Science: The Increasing Dominance of Teams in Production of Knowledge: Wuchty et al. 316 (5827): 1036 — Science
    • “…teams increasingly dominate solo authors in the production of knowledge… Teams typically produce more frequently cited research than individuals do, and this advantage has been increasing over time…knowledge creation has fundamentally changed.”
  • A Blog Around The Clock : Final Scifoo Wrap-up
    • Great summary of Sci Foo 2007 from Coturnix.
  • Kevin Kelly: Countdown Clock
    • Kelly has a clock on his computer screen, counting down the number of days to his (expected) death: “The time left is still too short. And too close. And getting closer. And I’m sorry but I need to do something else right now….”
  • Click here for all of my del.icio.us bookmarks.

    ]]>
    <![CDATA[Gordon Watts: Superstition in the D0 Control Room]]>http://gordonwatts.wordpress.com/2008/03/14/superstition-in-the-d0-control-room/2008-03-14T10:52:21ZGordon Watts

    There are lots of old superstitions - some of them we still live our lives by. Running a large experiment like D0 is no different. For example, there are a set of ducks along the console - the rumor is if they aren’t there then the whole system will cease to operate. I don’t think anyone has been brave enough to remove them… ;-)

    I pulled the following quote from a recent shift report:

    Beam was nice for a while.  Then while talking to Bill Lee about losing the beam, we lost the beam, thereby illustrating Bill’s spooky powers in the control room.

    Bill has long been making our control room run smoothly, and should know the lesson: don’t talk about loosing the beam! You’ll jinx it!! [Technical reason: apparently an important power supply went out of allowed operating range].

    ]]>
    <![CDATA[Chad Orzel: links for 2008-03-14]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/251285132/links_for_20080314.php2008-03-14T10:24:20ZChad Orzel
  • "Figure skating is the quintessential American sport, not merely because it is fiercely individualistic while at the same time incredibly conformist, but also because the athletes and fans, like the American electorate, have an extraordinarily high tolera
  • Sand.
  • More from New Orleans.
  • Official-type releases from Brookhaven.
  • "[A] series of experiments were undertaken that utilized electron spins in diamond to investigate different regimes of spin-bath interactions, and provide much information about the decoherence dynamics."
  • "[A] photon takes about 20 femtoseconds less to get through a stack of 31 layers, totaling a few microns across, when the stack begins and ends with high refractive index layers rather than the opposite. The shorter time delay is apparently superluminal."
  • I'm fond of this song, but not as much as this guy.
    (tags: music)
  • Read the comments on this post...]]>
  • "Figure skating is the quintessential American sport, not merely because it is fiercely individualistic while at the same time incredibly conformist, but also because the athletes and fans, like the American electorate, have an extraordinarily high tolera
  • Sand.
  • More from New Orleans.
  • Official-type releases from Brookhaven.
  • "[A] series of experiments were undertaken that utilized electron spins in diamond to investigate different regimes of spin-bath interactions, and provide much information about the decoherence dynamics."
  • "[A] photon takes about 20 femtoseconds less to get through a stack of 31 layers, totaling a few microns across, when the stack begins and ends with high refractive index layers rather than the opposite. The shorter time delay is apparently superluminal."
  • I'm fond of this song, but not as much as this guy.
    (tags: music)
  • Read the comments on this post...]]>
    <![CDATA[Marni Dee Sheppeard: M Theory Lesson 168]]>http://kea-monad.blogspot.com/2008/03/m-theory-lesson-168.html2008-03-14T06:13:27ZMarni Dee Sheppeardpermutoassociahedron also permits a circuit that passes once through each of the 120 vertices. It helps to paint the squares, pentagons and dodecagons in different colours. Try it! ]]>permutoassociahedron also permits a circuit that passes once through each of the 120 vertices. It helps to paint the squares, pentagons and dodecagons in different colours. Try it! ]]><![CDATA[Steve Hsu: Wanted: a beautiful mind]]>http://infoproc.blogspot.com/2008/03/wanted-beautiful-mind.html2008-03-14T01:12:59ZSteve Hsu

    New Yorker: ...The rumor, according to one (unofficial) e-mail: “Oscar-winning producer Brian Grazer (Da Vinci Code, A Beautiful Mind, American Gangster) is looking for a new cultural attaché.” The e-mail explained:

    This person would be responsible for keeping Brian abreast of everything that’s going on in the world; politically, culturally, musically. . . . They’re also responsible for finding an interesting person for Brian to meet with every week . . . an astronaut, a journalist, a philosopher, a buddhist monk. . . . There is LOTS of reading for this position! Grazer may ask you to read any book he’s interested in. You’ll probably get to read about 4 or 5 books a week and you may be required to travel with him on his private plane to Hawaii, New York, Europe—teaching him anything he asks you about along the way. . . . You will also be provided with an assistant. . . . Salary is around $150,000 a year. . . . You will be to Grazer what Karl Rove was to Bush.

    ...Michael Rosenberg, the president of Imagine, the production company Grazer owns with Ron Howard, said that about a hundred would-be attachés have e-mailed résumés since word of the job got out. One was Ed Cooke, twenty-six, a British writer and education consultant. His résumé: philosophy-and-psych degree from Oxford, three languages, a demonstrated interest in “the philosophy of cricket.” “This seemed like a job that would suit me,” Cooke said. He’d sent in a list of interesting people: the medieval scholar Mary Carruthers; the cricket star Shane Warne; Dmitri Nabokov.

    But Cooke didn’t make the final cut. By last week, Grazer’s staff had already narrowed the potential attachés down to four finalists, who would interview with the boss. “I’ve met a lot of good candidates,” Grazer said, reached on his cell phone en route to a meeting with the screenwriter for “Angels and Demons.” He said that he’d been hiring cultural attachés for twenty years, ever since he asked Jonas Salk’s assistant to help him track down interesting people in science. Fifteen or twenty people have held the job since then. (The “attaché” title started out as a joke.) “They have to be really resourceful,” Grazer said. “I like to meet people in dangerous organizations, and my cultural attaché finds out who that person is—who runs the Yakuza, or the Masons, or MI5.” The best attaché so far, Grazer said, has been Brad Grossman, the current one, who is leaving the post, after four years. Grossman is thirty-two; he owned a tutoring business before taking the job, and Grazer said that he is especially good at explaining the things he’s asked to learn about—bacteria or makeup or superdelegates. “I’m looking for a person who has that teacherlike quality,” Grazer said. “Also, it’s good to have a person who is a connector, who is liked by people.”

    Grazer has had one bad attaché experience. “A few years ago, I hired this really smarty-pants Harvard guy,” he said. “He was just remarkably lazy. If he didn’t get the Wall Street Journal on his desk, it was like it didn’t exist.” Still, he said, the experience came with a lesson: “Under no condition can you teach curiosity.”

    Before Grazer became a successful producer, he was—like most people— his own cultural attaché. Two weeks ago, he found a letter he’d written to the physicist Edward Teller during that period. “It made me remember how much work it was,” Grazer said. “I had to do the begging and grovelling and ass-kissing myself. I had to find the newspapers and magazines. Even then, I put so much thought and effort into trying to meet and learn from the people who mattered to me.”
    ]]>

    New Yorker: ...The rumor, according to one (unofficial) e-mail: “Oscar-winning producer Brian Grazer (Da Vinci Code, A Beautiful Mind, American Gangster) is looking for a new cultural attaché.” The e-mail explained:

    This person would be responsible for keeping Brian abreast of everything that’s going on in the world; politically, culturally, musically. . . . They’re also responsible for finding an interesting person for Brian to meet with every week . . . an astronaut, a journalist, a philosopher, a buddhist monk. . . . There is LOTS of reading for this position! Grazer may ask you to read any book he’s interested in. You’ll probably get to read about 4 or 5 books a week and you may be required to travel with him on his private plane to Hawaii, New York, Europe—teaching him anything he asks you about along the way. . . . You will also be provided with an assistant. . . . Salary is around $150,000 a year. . . . You will be to Grazer what Karl Rove was to Bush.

    ...Michael Rosenberg, the president of Imagine, the production company Grazer owns with Ron Howard, said that about a hundred would-be attachés have e-mailed résumés since word of the job got out. One was Ed Cooke, twenty-six, a British writer and education consultant. His résumé: philosophy-and-psych degree from Oxford, three languages, a demonstrated interest in “the philosophy of cricket.” “This seemed like a job that would suit me,” Cooke said. He’d sent in a list of interesting people: the medieval scholar Mary Carruthers; the cricket star Shane Warne; Dmitri Nabokov.

    But Cooke didn’t make the final cut. By last week, Grazer’s staff had already narrowed the potential attachés down to four finalists, who would interview with the boss. “I’ve met a lot of good candidates,” Grazer said, reached on his cell phone en route to a meeting with the screenwriter for “Angels and Demons.” He said that he’d been hiring cultural attachés for twenty years, ever since he asked Jonas Salk’s assistant to help him track down interesting people in science. Fifteen or twenty people have held the job since then. (The “attaché” title started out as a joke.) “They have to be really resourceful,” Grazer said. “I like to meet people in dangerous organizations, and my cultural attaché finds out who that person is—who runs the Yakuza, or the Masons, or MI5.” The best attaché so far, Grazer said, has been Brad Grossman, the current one, who is leaving the post, after four years. Grossman is thirty-two; he owned a tutoring business before taking the job, and Grazer said that he is especially good at explaining the things he’s asked to learn about—bacteria or makeup or superdelegates. “I’m looking for a person who has that teacherlike quality,” Grazer said. “Also, it’s good to have a person who is a connector, who is liked by people.”

    Grazer has had one bad attaché experience. “A few years ago, I hired this really smarty-pants Harvard guy,” he said. “He was just remarkably lazy. If he didn’t get the Wall Street Journal on his desk, it was like it didn’t exist.” Still, he said, the experience came with a lesson: “Under no condition can you teach curiosity.”

    Before Grazer became a successful producer, he was—like most people— his own cultural attaché. Two weeks ago, he found a letter he’d written to the physicist Edward Teller during that period. “It made me remember how much work it was,” Grazer said. “I had to do the begging and grovelling and ass-kissing myself. I had to find the newspapers and magazines. Even then, I put so much thought and effort into trying to meet and learn from the people who mattered to me.”
    ]]>
    <![CDATA[Peter Woit: Electric-Magnetic Duality on a Half-Space]]>http://www.math.columbia.edu/~woit/wordpress/?p=6662008-03-14T01:02:35ZPeter WoitThe past few weeks I’ve often been going down to the IAS in Princeton on Thursdays to hear talks given as part of the special program there this semester in mathematics. These talks included a series of five talks by Witten; notes from David Ben-Zvi and Sergei Gukov are available here.

    The first three talks concentrated on the existence of a very special superconformal six-dimensional QFT, and information that could be derived from what is known of its properties. Such a theory is an inherently quantum object, lacking a usual sort of classical limit or Lagrangian formulation. Witten compares it to the holomorphic conformal field theory that appear as “square roots” of the WZW model. These field theories are closely related to the representation theory of loop groups and at the core of a several important mathematical developments of the last couple of decades. The mathematical significance of the six-dimensional theory remains much more mysterious, and Witten argues that understanding this mystery is a very worth goal for both mathematicians and physicists. . For more about this, see the article Conformal Field Theory in Four and Six Dimensions, based on his lecture at the Oxford conference in honor of Graeme Segal’s 60th birthday back in 2002. Taking the six dimensions to be the product of a torus and a four dimensional space, the existence of such a superconformal six dimensional theory implies an SL(2,Z) symmetry of N=4 Super-Yang-Mills on the four dimensional space. This includes the famous Olive-Montonen non-abelian electric-magnetic symmetry that is responsible for Langlands duality in Witten’s 4d QFT approach to Geometric Langlands.

    The last two talks of the series dealt with a different topic, boundary conditions in N=4 SYM. Taking this theory on the half-space with boundary conditions, one can ask about the implications of non-Abelian electric-magnetic duality for these boundary conditions. Witten has recently been working on this subject with Davide Gaiotto, he’ll be talking about it later this month at a Stony Brook symposium in honor of C. N. Yang and Jim Simons, and I assume a paper will appear sooner or later. In his IAS lectures Witten was talking to mathematicians and arguing that “universal” operations (ones that can be done uniformly for all Riemann surfaces) in geometric Langlands should all come from the properties of these boundary conditions. Note that in this work what appears is the full N=4 SYM theory, not just the topological twisted version. This theory plays a central role in AdS/CFT, so if new information about its physics arises from this study, this should be directly interesting for physics, although Witten did not discuss this in his talks.

    The two sorts of boundary conditions that get related by duality are analogs of Neumann and Dirichlet boundary conditions. The Neumann boundary conditions involve superconformal 3d QFTs, examples of which were studied by Intriligator and Seiberg in their 1996 paper Mirror Symmetry in Three Dimensions. Witten has previously worked on this kind of thing in the Abelian case, see here.

    During these visits to the IAS I got the chance to meet Meng-Chwan Tan, who is there in the Physics group this year. He has been working on a different QFT approach to geometric Langlands, one that is purely two-dimensional and based in conformal field theory, using (0,2) sigma models on flag manifolds, and has just posted a the revised for publication version of his paper on the subject here. This is much closer to the approach to geometric Langlands via conformal field theory that Edward Frenkel has described here.

    In other geometric Langlands news, there was a workshop on Homological Mirror Symmetry recently in Miami, with notes from many of the talks available here (and a blog posting by Joel Kamnitzer here). And there’s another one (notes here from David Ben-Zvi) going on this week at the IAS. I better stop now, go and get some sleep so I can head down there tomorrow morning to catch the last day of it.

    ]]>
    <![CDATA[David Hogg: calibration]]>http://hoggresearch.blogspot.com/2008/03/calibration.html2008-03-13T22:02:44ZDavid HoggI spent a great morning at the CfA vising the plate scanning project DASCH. The plate scanner is beautiful, and I saw it in action. I also saw the 100 tons of plates in the plate stacks, and was suitably impressed with the care with which they are maintaining and carrying forward all the meta-data they have. Then they apply some good automatic calibration and are building an archive. I learned from Josh Grindlay that there are enough plates in the Harvard archive alone to have fully imaged the sky 500 times over.

    Earlier in the morning I met with Chris Stubbs and discussed many issues related to performing precise calibration of astronomical data sets and providing enough information back to users that the data set will play well with others. We put in some good hours on truly fundamental things such as: What does a telescope really measure? (integrals of the photon phase-space density, in my view) and All precise observations are necessarily relative to astronomical sources with (fundamentally) unknown spectral properties. Stubbs is a deep thinker, and obviously I would say that because he thinks about these things much as I do! Now here's to him taking over the world and bending it to his will.

    ]]>
    I spent a great morning at the CfA vising the plate scanning project DASCH. The plate scanner is beautiful, and I saw it in action. I also saw the 100 tons of plates in the plate stacks, and was suitably impressed with the care with which they are maintaining and carrying forward all the meta-data they have. Then they apply some good automatic calibration and are building an archive. I learned from Josh Grindlay that there are enough plates in the Harvard archive alone to have fully imaged the sky 500 times over.

    Earlier in the morning I met with Chris Stubbs and discussed many issues related to performing precise calibration of astronomical data sets and providing enough information back to users that the data set will play well with others. We put in some good hours on truly fundamental things such as: What does a telescope really measure? (integrals of the photon phase-space density, in my view) and All precise observations are necessarily relative to astronomical sources with (fundamentally) unknown spectral properties. Stubbs is a deep thinker, and obviously I would say that because he thinks about these things much as I do! Now here's to him taking over the world and bending it to his will.

    ]]>
    <![CDATA[Michael Nielsen: Investing in undervalued human capital: the Y Combinator model]]>http://feeds.feedburner.com/~r/michaelnielsen/wmna/~3/250994829/2008-03-13T21:15:59ZMichael NielsenY Combinator (YC) is a small Cambridge-based firm that for the past few years has been carrying out a remarkable experiment. What they’ve been doing is investing money and training in (mostly) young hackers, helping them get technology companies up and running to the point where more more conventional investment processes like venture capital can kick in. Many YC funded companies have been successful, with several making their founders wealthy at an early age.

    At first glance, YC may appear only of interest to business or technology people. In fact, there are broader things one may learn from the model, with applications and importance outside business and technology.

    If you’re not familiar with how YC works, it goes something like this. Twice a year, YC calls for applications to be submitted, either for its Winter or its Summer programs. Applications are submitted by small teams of people (”founders”), typically in their twenties, who would like to start or have recently started a technology company. YC evaluates the applications, and the best are asked to join the YC program. Successful applicants typically receive $5k + $5k per founder to support them for three months, and are required to move to Boston (for the Summer program), or the San Francisco Bay Area (for the Winter program). All the YC teams meet together once or twice a week, to talk with each other and with the YC partners, as well as with a changing cast of expert entrepeneurs specially brought in from outside. The three month program concludes with “Demo Day”, where the founders demonstrate what they’ve built to a large group of angel investors and venture capitalists, in the hopes of sparking further interest. In return for this program, the founders give up a small percentage of their company, typically between 2 and 10 percent.

    What makes the YC program successful is that YC have identified a large group of people whose talents were previously undervalued and underutilized, in large part because of their age and lack of experience. For more than thirty years, high-school geeks have played with technology, gone off to university, where they continue to play with technology, often doing astounding and innovative things, but rarely having the entrepeneurial skills or connections to turn their ideas into marketable products. At the end of it all, they go off to work for a big established technology company like Microsoft.

    YC has asked a big “what if?” question: what if we gave these talented people an opportunity to build their own company, from the ground up, and gave them training in entrepeneurial skills they lack, complementary to their existing technical ability? Might it be that if we provide this training (which is relatively easy to do), then these people will create more value than if they were off working for big existing technology companies?

    It is evident from the above description that this process can be abstracted away to a core unrelated to technology:

    • Identify a talented group of people who are at present undervalued, i.e., not being given an opportunity to contribute commensurate with their talents.
    • Set up a competitive program whereby people in your target group can apply for support.
    • Select the best applicants for support.
    • Help educate successful applicants, trading off the costs of the education against the value that comes from their increased probability of success.
    • Make sure you market yourself to the desired group of people, so you get the best possible pool of candidates (e.g., here and here).

    What’s special about YC is the group they’ve identified: young hackers, whose lack of experience means they often have a hard time being considered seriously by existing investors such as venture capitalists. Ironically, this is in part because the venture fund model typically involves investments that are, at a minimum, hundreds of thousands of dollars. Given a choice between investing that money in a 35-year old Harvard MBA’s startup, and a team of three unshaven 21 year-old hackers, most venture partners will go for the Harvard MBA. Part of YC’s insight is that in 2008 many technology companies can be launched for just a few tens of thousands of dollars, far less than the venture funds provide.

    Other organizations have adopted an analogous strategy to YC, but for a different group of otherwise undervalued people. A good example is microfinance organizations like the Grameen Bank, which provide small loans to assist entrepeneurs in the developing world. The success of the Grameen Bank indicates that investors previously underestimated the talents of the lendees to build successful businesses. An interesting social consequence common to YC and the Grameen Bank is that both empower people who are otherwise somewhat disenfranchised. (Obviously, the effect is far greater in the case of the Grameen Bank.)

    This process of identifiying a talented group of people who are undervalued by the investment market is a curious one. An uncritical advocate of the free market might counter that such people shouldn’t exist - surely investors would have already tracked them down, and offered to invest. In fact, YC is a clear case where (up to now) the market has failed badly, due to the blinkered narrowness of investors. Is it more risky to offer one million dollars to finance a Harvard MBA in their new technology venture, or to fund twenty groups of talented twenty-one year old hackers, at a cost of about $50k each (including the training costs and other overheads)? My money would be on the twenty-one year olds to make a greater aggregate return, but I suspect most investors would feel much safer going with the Harvard MBA - even if they fail, it’s a lot easier to defend your choice to your peers.

    What other undervalued sources of human capital might this general model be applied to? When I started to think about this question, I quickly came up with dozens of possible groups. Here’s the first few that came to mind:

    • Talented people who happen to have been born in the wrong place for their talents to flourish. The top students at (for example) the big IITs in India are incredibly talented. While India offers increasing opportunities for technology entrepeneurs, imagine the results of bringing some of the more entrepeneurial students to Silicon Valley, and helping them get set up with technology companies. Think YC with a visa program.
    • The elderly. As a society, we cut many extremely talented and active people off from contributing society, at great cost to them, and to society as a whole. It’d be great to find ways their talents could be made better use of.
    • Bright PhD students in insanely competitive and challenging academic subjects, where even extraordinary students may have trouble getting good academic jobs, and where those same students may lack the connections to find jobs outside academia that make good use of their talents.
    • My current hometown of Waterloo, Canada, is a pretty good setting for a YC style program. It has a growing startup culture, and two universities (University of Waterloo and Wilfred Laurier University) with, respectively, strong technology and business programs. As a rough indicator of student quality, in programming and mathematics competitions, University of Waterloo students are routinely competitive with the best from MIT and other top US Universities. At present, many of these students go to work for large technology companies elsewhere - the University of Waterloo is sometimes said to be Microsoft’s single largest recruiting target. Something like YC would, I think, be highly successful here, although it would need to compensate for a relative paucity of local investors.
    ]]>
    <![CDATA[David Hogg: innovative computing]]>http://hoggresearch.blogspot.com/2008/03/innovative-computing.html2008-03-13T18:54:37ZDavid HoggI spent the day at Harvard between the CfA and the Institute for Innovative Computing, where I gave my automated astrometry and open-source sky survey talk. I also spent some time chatting with Willman about our projects with Zolotov, and with the IIC staff about computation in science.

    ]]>
    I spent the day at Harvard between the CfA and the Institute for Innovative Computing, where I gave my automated astrometry and open-source sky survey talk. I also spent some time chatting with Willman about our projects with Zolotov, and with the IIC staff about computation in science.

    ]]>
    <![CDATA[Steinn Sigurðsson: Carnival of Space]]>http://feeds.feedburner.com/~r/DynamicsOfCats/~3/250896372/carnival_of_space_38_1.php2008-03-13T18:53:58ZSteinn SigurðssonI've lost count, but there is a new Carnival of Space over at Missy's place

    Read the comments on this post...]]>
    I've lost count, but there is a new Carnival of Space over at Missy's place

    Read the comments on this post...]]>
    <![CDATA[Steve Hsu: 2 million minutes: US vs China and India education]]>http://infoproc.blogspot.com/2008/03/2-million-minutes-education-in-us-vs.html2008-03-13T17:34:07ZSteve Hsudocumentary film (trailer below) about global education and competitiveness. The producer is a US venture capitalist who has spent time abroad in China and India.





    WSJ: ...Bob Compton, a Memphis-based venture capitalist, ran into many kids like Jack when he was traveling in China and India. They were two and three years ahead of his two teenage daughters -- not just in math and science, but in almost every other subject, too. That discovery prompted him to make a documentary called "2 Million Minutes," which followed students in the U.S., India and China to show how they spent their four years of high school -- which works out to about two million minutes.

    The film's conclusion: Chinese high-school students spend almost twice as much time on schoolwork as their American peers. (Indian kids spend half again as much time as Americans.)

    In Beijing, Jack used to average three or four hours of homework a day. In his Peoria high school, he spent less than an hour a day. At IMSA, homework demands around two hours a day, and Jack still has two hours to play basketball. He told me he's learning and happy.]]>
    documentary film (trailer below) about global education and competitiveness. The producer is a US venture capitalist who has spent time abroad in China and India.





    WSJ: ...Bob Compton, a Memphis-based venture capitalist, ran into many kids like Jack when he was traveling in China and India. They were two and three years ahead of his two teenage daughters -- not just in math and science, but in almost every other subject, too. That discovery prompted him to make a documentary called "2 Million Minutes," which followed students in the U.S., India and China to show how they spent their four years of high school -- which works out to about two million minutes.

    The film's conclusion: Chinese high-school students spend almost twice as much time on schoolwork as their American peers. (Indian kids spend half again as much time as Americans.)

    In Beijing, Jack used to average three or four hours of homework a day. In his Peoria high school, he spent less than an hour a day. At IMSA, homework demands around two hours a day, and Jack still has two hours to play basketball. He told me he's learning and happy.]]>
    <![CDATA[Michael Nielsen: The curse of busy-ness]]>http://feeds.feedburner.com/~r/michaelnielsen/wmna/~3/250874586/2008-03-13T17:14:00ZMichael NielsenWhy do powerful, intelligent, and accomplished people so often exhibit cluelessness or ignorance? (Examples can be supplied on demand, in the unlikely event you need them.)

    I don’t mean to rip on powerful people, many of whom become powerful because of outstanding personal traits. But I do think it’s worth understanding the puzzle of why so many people do great things in their youth, and then do apparently sillier things as they get older.

    I think my post about the bias towards power contains a partial explanation: powerful people’s ideas often aren’t tested as rigorously as those of the less powerful, and they find it easier to act while ignoring good advice. As an example, a regular Joe with an idea for starting a company has to convince other people of the idea in order to attract investment. A wealthy entrepeneur finds it much easier to get silly ideas funded, in part by investing their own wealth, and in part because other people give undue weight to their words.

    (This is also why comics and superheros like Spiderman are interesting: they show what happens when basically well-intentioned people can act without constraint. The results often aren’t pretty.)

    However, I think the bias towards power is only part of an explanation. Another part is that powerful people are often far too busy and focused. If you don’t create time just to fool around (”purposeless delectation in ideas” was Gian-Carlo Rota’s lovely phrase), you end up narrow, clueless, and irrelevant. It’s funny to hear that CNN’s Larry King has never used the net, or that George Bush (the elder) was amazed by supermarket barcode scanners in 1992, but, really, these people must have some massive blind spots.

    ]]>
    Why do powerful, intelligent, and accomplished people so often exhibit cluelessness or ignorance? (Examples can be supplied on demand, in the unlikely event you need them.)

    I don’t mean to rip on powerful people, many of whom become powerful because of outstanding personal traits. But I do think it’s worth understanding the puzzle of why so many people do great things in their youth, and then do apparently sillier things as they get older.

    I think my post about the bias towards power contains a partial explanation: powerful people’s ideas often aren’t tested as rigorously as those of the less powerful, and they find it easier to act while ignoring good advice. As an example, a regular Joe with an idea for starting a company has to convince other people of the idea in order to attract investment. A wealthy entrepeneur finds it much easier to get silly ideas funded, in part by investing their own wealth, and in part because other people give undue weight to their words.

    (This is also why comics and superheros like Spiderman are interesting: they show what happens when basically well-intentioned people can act without constraint. The results often aren’t pretty.)

    However, I think the bias towards power is only part of an explanation. Another part is that powerful people are often far too busy and focused. If you don’t create time just to fool around (”purposeless delectation in ideas” was Gian-Carlo Rota’s lovely phrase), you end up narrow, clueless, and irrelevant. It’s funny to hear that CNN’s Larry King has never used the net, or that George Bush (the elder) was amazed by supermarket barcode scanners in 1992, but, really, these people must have some massive blind spots.

    ]]>
    <![CDATA[Chad Orzel: FutureBaby Playlist: H-N]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/250841294/futurebaby_playlist_hn.php2008-03-13T16:51:10ZChad OrzelLooking at this segment of the playlist, it's clear that I was, consciously or not, giving a good deal of weight to how well a given song works as a sing-along. For whatever reason, this chunk of the artist alphabet is loaded with tunes that are maybe a little dubious content-wise, but good fun to sing along with.

    Read the rest of this post... | Read the comments on this post...]]>
    Looking at this segment of the playlist, it's clear that I was, consciously or not, giving a good deal of weight to how well a given song works as a sing-along. For whatever reason, this chunk of the artist alphabet is loaded with tunes that are maybe a little dubious content-wise, but good fun to sing along with.

    Read the rest of this post... | Read the comments on this post...]]>
    <![CDATA[Chad Orzel: Lab Visit Report: Francium]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/250800374/lab_visit_report_francium.php2008-03-13T15:32:49ZChad OrzelResearchBlogging.orgAs I mentioned a few days ago, I visited Luis Orozco's lab during our trip to DC last week. I already talked about his cavity QED stuff, but that's only one of the projects under development. He's also working on a next-generation apparatus for the laser cooling and trapping of francium, to be done at the TRIUMF accelerator in Vancouver-- francium is an element with no stable isotopes, and at most a few grams of it exist on the earth at any given moment. Luis and his students demonstrated the laser cooling of francium a few years back, using atoms made in an accelerator at Stony Brook out on Long Island.

    Why would anyone care about francium? The reasons are laid out in "Measurement method for the nuclear anapole moment of laser-trapped alkali-metal atoms" (link to arXiv preprint, because it's free; the published version is this Physical Review A paper). Francium is of interest precisely because it's a heavy element with no stable isotopes. The very large nucleus of francium means that weak interactions can produce an anapole moment in the nucleus, which would be a signature of parity non-conservation (PNC), and a possible indicator of new physics. They have an idea for a way to measure this using precision spectroscopy.

    Read the rest of this post... | Read the comments on this post...]]>
    ResearchBlogging.orgAs I mentioned a few days ago, I visited Luis Orozco's lab during our trip to DC last week. I already talked about his cavity QED stuff, but that's only one of the projects under development. He's also working on a next-generation apparatus for the laser cooling and trapping of francium, to be done at the TRIUMF accelerator in Vancouver-- francium is an element with no stable isotopes, and at most a few grams of it exist on the earth at any given moment. Luis and his students demonstrated the laser cooling of francium a few years back, using atoms made in an accelerator at Stony Brook out on Long Island.

    Why would anyone care about francium? The reasons are laid out in "Measurement method for the nuclear anapole moment of laser-trapped alkali-metal atoms" (link to arXiv preprint, because it's free; the published version is this Physical Review A paper). Francium is of interest precisely because it's a heavy element with no stable isotopes. The very large nucleus of francium means that weak interactions can produce an anapole moment in the nucleus, which would be a signature of parity non-conservation (PNC), and a possible indicator of new physics. They have an idea for a way to measure this using precision spectroscopy.

    Read the rest of this post... | Read the comments on this post...]]>
    <![CDATA[Chad Orzel: Tips for Speakers]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/250769067/tips_for_speakers.php2008-03-13T14:17:08ZChad OrzelOver at the new(ish) Of Two Minds, Shelley has posted a video giving advice on scientific presentations from a couple of guys at Michigan. They offer a few quick tips to giving better presentations:

    • Know your material well enough to give it without slides
    • Skip the outline (for short talks in particular)
    • Minimize text on slides
    • Make your figures big and visible

    The central point is really to put the focus on the data, not the words or slides.

    The one specific tip I would add to their list is this: When you put up a graph, you should clearly identify what is being plotted on what axes. The first thing you say should be "Here we have YYYY on the vertical axis versus XXXX on the horizontal axis," so that everybody knows what you're showing, without having to squint to read the labels.

    Read the rest of this post... | Read the comments on this post...]]>
    Over at the new(ish) Of Two Minds, Shelley has posted a video giving advice on scientific presentations from a couple of guys at Michigan. They offer a few quick tips to giving better presentations:

    • Know your material well enough to give it without slides
    • Skip the outline (for short talks in particular)
    • Minimize text on slides
    • Make your figures big and visible

    The central point is really to put the focus on the data, not the words or slides.

    The one specific tip I would add to their list is this: When you put up a graph, you should clearly identify what is being plotted on what axes. The first thing you say should be "Here we have YYYY on the vertical axis versus XXXX on the horizontal axis," so that everybody knows what you're showing, without having to squint to read the labels.

    Read the rest of this post... | Read the comments on this post...]]>
    <![CDATA[Chad Orzel: Headline Mismatch]]>http://feeds.feedburner.com/~r/scienceblogs/uncertainprinciples/~3/250716799/headline_mismatch.php2008-03-13T12:51:43ZChad OrzelWe live in a short-attention-span age. I have a huge array of feeds spewing information at me like the proverbial firehose, so I often don't do more than look at the headline and RSS excerpt, and I don't think I'm alone.

    Given that, it's more important than ever that the headlines given to articles actually, you know, match the contents. For example, when I see a story in the New York Times headlined Environmental Agency Tightens Smog Standards, I would like this to accurately reflect the contents of the story. When the first sentence of the story is:

    The Environmental Protection Agency announced a modest tightening of the smog standard on Wednesday evening, overruling the unanimous advice of its scientific advisory council for a more protective standard.

    I feel like I've been misled by the people writing the headlines. The headline is factually accurate, but nearly the opposite of the actual story in terms of connotation. "Environmental Agency Tightens Smog Standards" makes me think "Yay, progress!" while the story is yet another in a long litany of stories about political hacks ignoring or overriding scientific expertise.

    Read th