Category Archives: science

ScienceWoman’s New Digs

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Just thought I’d let you know that the blog of ScienceWoman (that I talked about in an earlier post) has now moved. Her blogging about her day to day experiences and thoughts as an early career woman scientist will be getting a whole lot more attention now that it is under the ScienceBlogs umbrella. Go and have a look at her new digs. She’s already started off nicely with a post asking readers to name their favourite woman scientist, with the resulting interesting contributions and discussions you’d expect in the comments. Go and add your two cents.

While I was over at ScienceBlogs (haven’t been in a long while) I spotted a rather […] Click to continue reading this post →

Tales From The Industry, XII – A Shooting Diary

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Here’s my promised report/diary on yesterday’s adventures in film-making.

history channel shoot september6:45am Got up a bit earlier than perhaps I should have, given that I got to sleep at 1:00am. Spent a while reading a ton of email, and sending some more. Will be away from my regular professoring duties for the whole day, and so wanted to make sure the fort was held. Prepared some appropriate TV clothing (pretty much what I wear normally anyway – simple solid colours), and so forth. Attempted to beautify myself just a tad (with the usual…inconclusive results). Shower and so forth. Coffee and oatmeal, sprinkled with NPR… Read a bit of stuff on dates of historical background on material I’ll be talking about. I often forget that sort of thing, and its never ever needed whenever I do remind myself of it, so after a few minutes I decided not to bother. The core physics ideas are more important, ultimately. Spent time looking for rain gear (the micro-brolly, basically), since supposedly there’s going to be a rainstorm later (hurrah! finally!). Ready to go.

8:45am Fifteen minutes later than I intended to (how did that happen?), I set off to walk to the Sunset/Vermont Red Line subway station. Waved to a neighbour, and we exchanged pleasantries about how nice a day it was.

8:47am Walked past surprised neighbour back toward home…. briskly.

8:52am Riding the Brompton (the folding bike, for those of you not keeping up), I cycled off to the Sunset/Vermont station.

9:01am Arrive at said station on schedule (one minute late does not count in LA), and […] Click to continue reading this post →

Whither String Theory? – Too Soon To Tell

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stringscape image from physics worldGosh, a thoughtfully-written general level (more or less) article on some of the general outcomes of string theory research! It’s written by Matthew Chalmers, and is in the Sept. ’07 edition of Physics World*. The article can be read online here, and downloadable pdf is here. The graphic on the right came with the article. I don’t fully understand what it is, but the title, like that of the article, is “stringscape”… Look, let’s not over-think this cvj – it’s a pretty decoration.

I’ve done a quick read of it (should re-read more carefully later on – it will no doubt have some emphases with which I disagree somewhat**) and I’d say it is very much worth reading. While not a perfect summary (what is?), compared to a lot that’s been out there, you’ll find it rather more informed, less sensational, (refreshingly unpoisoned by various prejudices, such as the presentations of Smolin and Woit – see numerous earlier discussions in the “More Scenes from the Storm in a Teacup” series of posts, and others), and unafraid to go to some length to unpack the issues somewhat carefully.

Very importantly, it contains numerous quotes from various respected researchers in […] Click to continue reading this post →

Home School

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simpsons schoolThis is very interesting to me. I just heard a story (by Nancy Mullane) on NPR’s Weekend Edition about home schooling. (The link is here, and audio will be available at that page shortly). It focuses on the issue that African Americans are the fastest growing group of adopters among minorities in the US. I was also not aware that homeschooling is on a rapid rise.

This raises all sorts of questions for me. Very basic ones. How well does homeschooling work? Does the “product” – an educated person – perform well afterwards, once they’ve rejoined educational settings with the more traditional social environments (colleges and universities). Does the reduced level of social interaction during those homeschooling years have an adverse effect, or is it compensated for by social interaction that presumably takes place after school? Perhaps there are arguments that the reduction in social interaction even helps in some ways? I really don’t know much about this. Do you? I presume there’s all sorts of statistics on this, but I’d be curious to hear a bit of anecdotal discussion in the comments. Perhaps you were homeschooled? Have friends who were? Are homeschooling someone now? Are being homeschooled now? Tell us what you think!

I wonder about this since I’m curious as to whether this results in a different (better, […] Click to continue reading this post →

I’ve Got Next

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Ok. So I want to make this post timely, but it means that it will begin to let a cat out of the bag. We’ll see how much I can save for a later post as I write1.

So, as I walked to the subway this morning (yes, they have one in LA), I went through my little checklist of things I take on self-assigned assignments of this sort.

Notebook for scribbling: Check
Pen for scribbling: Check
Camera: Check
Phone (now with decent back-up camera): Check
Spare battery for camera: Check
Decent excuse/reason for being spectacularly late: Check
Water: Check
Good footwear for endless walking back and forth: Check

By now you get it. I’m either doing one of my parade reports, or perhaps a street fair/party, museum exhibit, or some random science fair, object or installation or other. Yes, but which? Well, apparently I was going to the future:

nextfest visit photo

The scene: The Los Angeles Convention Center. The event: The NextFest, brought to […] Click to continue reading this post →

From the Earth to the Moon

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Well, I’m reporting on this as part of a longer blog post about an event I attended today at the Los Angeles Convention Center, but since it’ll take me a while to finish, and it will be buried in all the other stuff (including pictures and so forth), I’ll snip out a bit of what I’m saying there to inform you of this interesting development:

google lunar x-prize posterSo what were some of the big ticket items, at least in terms of where all the regular press were? Well, the biggest was of course the X-prize. There was a long movie with lots of stuff about space, and dreams about our future in space, and animations and things of roving robots on planetary surfaces, and all that good stuff…. very nice, I thought, and began to wander off…. and then there was a round of applause from everyone and I came back as a voice announced “The Google Lunar X-Prize”, and various other people showed up on the stage (like one of the founders of Google – forgot his name, and later, good ol’ Buzz Aldrin, who seems to be required at these sorts of events). The Google co-founder guy began his speech by acknowledging all the Google engineers… and announcing that they’d just launched a new version of the moon. Applause. (I’m pretty sure that they mean Google Moon, by the way.)

[…] Click to continue reading this post →

Monolith Not Spotted, Yet

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iapetus flyby image by cassiniDrat.

Well, maybe on the next flyby. Flyby page here. AP (via Yahoo) story by Alicia Chang here. Interesting extracts:

The international Cassini spacecraft went into safe mode this week after successfully passing over a Saturn moon that was the mysterious destination of a deep-space faring astronaut in Arthur C. Clarke’s novel “2001: A Space Odyssey.”

..and intriguingly: […] Click to continue reading this post →

The 9/11 Flip

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Dijkgraaf Verlinde Verlinde 9 -11 flip figureOk, so here goes. A bit of physics linked to this all so significant date. There’s this term that people in string theory were using a lot in the middle to late 90’s, called the “9/11 flip”. I think maybe the Verlinde brothers, Erik and Herman, possibly in conjunction with Robbert Dijkgraaf, made the term popular but I am not sure about that and I welcome a correction. [Update, since there is some confusion: I’m talking about the term here, not the technique itself, which is older.]

(On right (click for larger) is a snapshot of one of the figures from their influential 1997 “Matrix String Theory” paper. You can see the use the term there, and it is in the paper’s text too, and soon everyone was using it in seminars and other papers to follow.)

The flip became particularly useful when people were discovering the wonders of “M-theory”, which is the catch-all term for whatever is the parent theory of string theory, something we are still trying to formulate. There are a number of narrower uses of the term, however – some more justified than others. For a while, everyone was thinking about the five ten-dimensional supersymmetric string theories (“type IIA”, “type IIB”, “type I”, and two types of “heterotic” theory) which, prior to the middle of 1995 (actually as early as late 1994 or early 1995) all seemed like totally distinct theories, and in the post middle-1995 era (after Witten’s remarkable talk at strings 1995 here at USC: paper here) were recognized to be all part of the same theory. The universe (at least the continually expanding string theory one) changed radically overnight.

m-theory puzzle
(One of my preferred ways of presenting the puzzle that is M-theory, and how the ten dimensional string theories fit in the puzzle. This is a slide from one of my general talks on the subject.)

The 9/11 flip is really simple, although when a setting is complicated enough, it can […] Click to continue reading this post →

Origins of a Species-Killer?

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In case you missed this earlier this week, there was an intriguing detective science story that, if correct, has yielded remarkable news about the past of our planet, and of course, us. From an AP story by Richard Ingham (via Yahoo):

asteroid collision event simulationThe extinction of the dinosaurs 65 million years ago can be traced to a collision between two monster rocks in the asteroid belt nearly 100 million years earlier, scientists report on Wednesday.

The smash drove a giant sliver of rock into Earth’s path, eventually causing the climate-changing impact that ended the reign of the dinosaurs and enabled the rise of mammals — including, eventually, us.

(Image above: Simulation images (AFP/HO/Don Davis) of the asteroid collision event, and the resulting extinction collision event on earth, and the collision with the moon.)

The scientists are William Bottke, David Vokrouhlicky and David Nesvorny, working at the Southwest Research Institute in Colorado. They traced the rock to a collision event that took place in the inner parts of the asteroid belt somewhere about between 140-190 million years ago, producing the family of fragments collectively called the Baptistinas, the largest being Baptistina 298. Over time, some of the fragments found […] Click to continue reading this post →

Categorically Not! – Mistakes!

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Julia Sweeney during a Categorically Not! eventThe next Categorically Not! is Sunday September 9th. The Categorically Not! series of events that are held at the Santa Monica Art Studios, (with occasional exceptions). It’s a series – started and run by science writer K. C. Cole – of fun and informative conversations deliberately ignoring the traditional boundaries between art, science, humanities, and other subjects. I strongly encourage you to come to them if you’re in the area.

Here is the website that describes past ones, and upcoming ones. See also the links at the end of the post for some announcements and descriptions (and even video) of previous events. (Above right: Julia Sweeney performing an extract from her play “Letting Go of God”, in the event with the theme “Uncertainty”.)

The theme this month is Mistakes! Here’s the description from K C Cole:

Blunders, boo boos, bloopers, errors, slip-ups, goofs, misinterpretations and misunderstandings. Everyone makes mistakes. In science, the notion of “mistake” is often itself misunderstood. Frequently, a “mistake” often turns out to be nothing more than a limited or skewed perspective. Or as Einstein put it, discovering a new theory is not so much like tearing down a house to build a new one as climbing a mountain from which one can see farther; the old “house” is still there, but is seen in a vastly different context. Mistakes in personal life and […]

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Paneful Jigsaw

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Temperature update: Going to be 106oF today. I think at 7:30am when I got up today it was already in the mid 80s (although that might have been partly due to reduced airflow indoors – I had to rush outside to take a deep breath). Gosh.

window shatter pattern
Above is part of a puzzle I was working on for a while on Saturday. A more detailed and larger image will follow below. I did pretty well, but then I got distracted after a while (see below). The last puzzle pieces came from (I suspect) a single puzzle piece shattering in a secondary event. The primary event? Bit embarrassing. I was preparing dinner on Thursday night, a guest was about to arrive, and a fly entered the kitchen. I hate flies in my kitchen at the best of times, and this was just too much. I tried to open the window to encourage the beast to depart, and it refused. I tried to open the window further and exasperatedly wafted my hand in its direction to scare it off the window pane, misjudged that action and pushed my hand through the window. Felt like a real idiot, of course: An expensive mistake, an awkward thing to explain, and of course a million flies and other creatures now had unrestricted access… The good news is that I only got a slight nick from the razor sharp edges, my guest did not think I was too insane (or no more than I usually am) and dinner was tasty. So all’s well that ends well.

The next morning I woke up and immediately thought “I can’t believe I put my hand through my window”. Went downstairs to check. Yes, it was true. There was a nice shatter pattern (notice the cracks radiating outward from the reconstructed impact point – see photo and discussion below) to admire, and lots of bits of glass on the […] Click to continue reading this post →

Lookin’ For Some Hot Stuff

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___________________________________________________________________________________
Hot, hot, hot, hot stuff
hot, hot, hot
hot, hot, hot, hot stuff
hot, hot, hot

– from “Hot Stuff”, by Donna Summer (1979). I refer to not only the physics but the c. 100 oF temperatures we’ve been having here every day recently.
___________________________________________________________________________________

On my way back from the conference, I spotted this book (left) last Saturday in Foyles (the booksellers) in London 1. Quark Gluon Plasma book It is a collection of reprints of a lot of the papers forming the foundations of the physics of the quark-gluon plasma (QGP) idea, going back the early to mid 1970s with such papers as Collins and Perry (Gosh, I had no idea Malcolm was one of the early workers on this idea. He’s much more thought of as associated with black holes, gravity, strings and so forth, ideas which – ironically – have recently turned out to be relevant to the discussions of the physics too. See my recent post, and there are also various popular articles to be found2).

Putting aside the usual ridiculous price that Springer Elsevier charges for books, I found myself in two minds about this book, in view of the surprises being uncovered about the properties of this remarkable state of matter at the RHIC experiment. Is this collection of early papers a useful working tool, or is it now just of historical interest, since many of the basic expectations about the properties of the plasma seem now to be incorrect?

rhic collision of gold ionsWell, after a bit of thought, I decided that the latter view would be way too hasty. First and foremost, on a general level, even if some of the computations in some papers were done in the “wrong” light (it’s a strongly coupled liquid that flows, not a weakly coupled gas of quarks and gluons), much of their content will still be useful in many ways – good and correct calculations last for all time, it is the sense of the words decorating them that may crumble over time. More specifically, one can worry about whether there were assumptions (and approximations based on those) that went into the computations that will render […] Click to continue reading this post →

They’re Out There (Probably)

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alien from the movieLet’s talk about aliens. I don’t mean people coming across the borders of whatever your country happens to be (although I did giggle a decade ago when I was given an official “alien number” by the powers that be back then – though I always regretted bypassing the “alien with extraordinary ability” status that the O1 visa gives you), I mean living creatures from beyond planet earth (it’s also interesting to consider the possibility that the seeds for life on earth may also have come from elsewhere).

It’s one of my favourite topics to consider, which is why I like to follow a lot of the remarkable things we are learning about our neighbouring planets (and other bodies like moons, asteroids, comets, and, yes minor planets like our old friend Pluto), and of course the ever-increasing variety of extra-solar planets (the ones we are discovering orbiting other stars). Overall, it gives one the sense that it is overwhelmingly likely that we are not alone (to use the tired old phrase), which to me is tremendously exciting.

I think we’ll find lots of compelling evidence that there’s lots of simple life on other bodies relatively soon, and I think that when people on the street hear of this, they’ll find it interesting enough. But I suspect that this will completely different to an […] Click to continue reading this post →

Total Eclipse of the Moon

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nasa total eclipse informationHow come there’s no song with this as the title? Sung by someone with a gravelly voice…. (Sorry, semi-obscure ’80’s music reference.)

Anyway, yes, there is one later tonight (more properly, early in the morning on Tuesday). For West Coasters, the interesting phase starts at about 1:50am, and it’ll last for well over three hours, going total at 2:52am and coming out of total at 4:22am. Please make the appropriate adjustment for other timezones.

This is good news for me, as I’ve got eight hour jet-lag from flying back from England […] Click to continue reading this post →