Busy couple of weeks…

…actually, busy couple of months. I just finished reading “The Making of the Atomic Bomb,” by Richard Rhodes, and I can’t recommend it highly enough; it’s an amazingly engaging bit of history, well-researched and exceptionally written. And, of course, rather creepy to read.

It’s also got me thinking about an idea for a sophomore or junior-level physics course in nuclear physics, that would try to combine serious theory, engineering, experiment, and history; essentially following the early development of the subject, actually doing all of the major experiments (it’s one of the few fields of physics where that’s possible in a classroom setting), and getting the students up to the point where they understand both the technical and ethical issues associated with their field. I suspect it could be a great way to both really draw in the very serious students and to give them a much-needed parallelism of experiment and theory in a class.

(I remember that I didn’t get my first really interesting experimental physics class until my senior year. That was the year I got thrown in a lab with a bunch of spare parts and told to measure things. I remember building a gamma spectrometer and spending hour after hour looking for interesting things I could examine with it… and had I had a class like that a few years earlier, my life might have turned out very differently. Oh well… thus the urge to teach it to others.)

Also: It looks confirmed, my cousin Sharon is getting married in early June, so I’m going back to Israel for a few weeks. (Finally!) And my grandmother promised to teach me the basics of wood sculpture while I’m there. (And if it weren’t for the wedding being in June, I would probably go much sooner… dammit, I need a trip. Right now a few weeks in Israel and a few days on the side in Paris sounds really, really appealing)

Published in: on December 15, 2004 at 23:22  Comments (4)  
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Science update

A new report on substantial progress in treating spinal injuries with embryonic stem cells, from UC Irvine. They managed to cause the cells to grow into new myelin sheaths for neurons.

(Side note, which the article doesn’t mention: This couldn’t have been done with adult stem cells; working on neurons more or less requires totipotent cells, and thus embryonic research. Let the politics begin…)

Published in: on November 23, 2004 at 09:39  Comments (6)  
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Friday night…

…and I’m sitting in a cafe, drinking coffee and trying to understand K-theory. It’s probably a sign that I’m a geek, that this seems to be one of the most wonderful ways possible to spend a Friday night.

Incidentally, since I know there are other geeks out there: Does anyone happen to have a good intuition for Bott periodicity, in any context whatsoever? (Topological K-theory, algebraic K-theory, cohomology, something else…) I’m feeling very stuck in not having a good intuition for why it works.

Published in: on November 19, 2004 at 22:07  Comments (18)  
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An afterthought…

Following up the analogy of individual to cell, species to organ, and biome to organism, and probably taking the metaphor to a place where it should never, never be allowed:

We might wonder what the functions of the human “organ” are in the system. If indeed the entire planet can be thought of as a single biome, the only way it could ever reproduce itself would involve seeding its particular biota onto other planets; so it could be that the urge for space travel is really a reproductive urge.

That’s right, we may well be the Earth’s gonads.

(This is not meant to detract from the actual serious intent of the previous post, and I am actually interested in comments and discussion on that one – this is just something that came up during a conversation last night)

Published in: on July 16, 2004 at 09:47  Comments (18)  
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Thought on reproduction and the meaning of species

I was recently reading a short story by Samuel Delany, which included the statement

“The reproductive function, was it primary or adjunctive? If… you
consider the whole ecological balance a single organism, it’s adjunctive, a vital
reparative process along with sleeping and eating”

This has been bugging me somewhat ever since, and I believe I’m starting to get a handle on why.
A thought on the perspectives of biology

Published in: on July 15, 2004 at 23:31  Comments (13)  
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Your weird science news of the day

Our bodies are apparently eager little cannibals.

Published in: on July 8, 2004 at 21:17  Comments (4)  
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THEY DID IT!

SpaceShipOne completed the first private manned spaceflight this morning.

Published in: on June 21, 2004 at 08:59  Comments (6)  
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Interesting science reading for the day:

For those of you interested in astrophysics, this week’s Science has a very interesting set of articles about pulsars, magnetars and neutron stars. Particularly interesting are the news articles “The Pulsar Menagerie” (1) and “Crushed by Magnetism,” (2) and Lattimer and Prakash’s review article “The Physics of Neutron Stars.” (3) The latter includes a great discussion of the state of our understanding of type II supernovae and how neutron stars are formed.

(Interesting thought from this: The typical total energy release in a type II SNa is ~3*1053 erg, about 10% of the total mc2 for the star. Of this, about 1% is kinetic energy, 0.01% is photons, and the overwhelming remainder is a wall of neutrinos. During one key stage in the collapse, a region of star becomes sufficiently dense to become opaque to neutrinos (! – mean free path of about 10cm over a 20km region) so energy can build up in this form, and it’s the sudden release of that which triggers the primary explosive shock wave. There’s just something neat about that.)

And on another side, there’s a new report out by Laumann et al titled The Sexual Organization of the City. (4) It discusses how cities tend to split into several independent “sexual marketplaces,” often with radically different customs, leading to questions about how cities need to manage things like health and social issues with more refined tools. So far, I’ve only read the NY Times review, but I intend to get my hands on a copy of the full report asap – it looks like a good read.


(1) Science, 23 April 2004, vol. 304 pp. 532-3
(2) Science, ibid., pp. 534-5
(3) Science, ibid., pp. 536-41
(4) E. O. Laumann et al., (eds.) The Sexual Organization of the City, Univ. of Chicago Press, Chicago, Ill., 2004.

Published in: on May 1, 2004 at 14:53  Comments (6)  
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Conjecture

The porn business is high-margin low-volume, very competitive and has a low turnaround time. This forces it to be extremely responsive to even subtle undercurrents in the mood of its customer base.

Conjecture: The set of popular textual advertisement themes for porn (e.g. subject lines of porn spam) undergoes systematic collective fluctuations. (New popular themes arise and disappear) These fluctuations contain a nontrivial signal about the current zeitgeist among the primary target audience (suitably subsection the audience if there is enough breadth in the market to justify so doing) and could be usefully mined for a lot of interesting information about what’s going on in the country. Its fast response time makes it particularly interesting.

This could be a better signal than e.g. tabloid covers, since while they have similar fluctuation patterns, they seem to have settled down into a fairly constant set of themes that doesn’t fluctuate nearly as broadly as porn.

Opinions?

Published in: on March 7, 2004 at 15:46  Comments (3)  
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Things you learn…

One of my favorite Jack Chick tracts. (For those of you not familiar with these, they’re… shall we say… very Christian little pamphlets that evangelists hand out on street corners. This one in particular is about evolution, and why it’s obviously incorrect and against all religious law)

According to this tract, quantum chromodynamics is a lie, gluons do not exist, and strongly interacting particles are held together by the direct force of divine intervention. (Which is, apparently, somehow distinguishable from gluons. Maybe it has different scattering properties or something.)

That’s going to be a very busy personal divinity. There are a lot of baryons in this universe.

I think I’m going to have to start using the phrase “As busy as the Holy Ghost during baryogenesis.”

Published in: on February 16, 2004 at 01:04  Comments (6)  
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