Category Archives: science

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.
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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 →

Exploring QCD in Cambridge

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exploring qcd sign

So the conference here at the Newton Institute in Cambridge is simply marvellous. I’m so glad I came, and so happy that I was invited to attend and make a contribution to it by giving a talk and having discussions. It’s a rather splendid combination of experimentalists, phenomenologists, and various hardcore theorists of various sorts, and there are ideas just flying around and bouncing off the walls. The title is “Exploring QCD: Deconfinement, Extreme Environments and Holography”, (it’s organized by Nick Evans, Simon Hands, and Mike Teper) and the focus is very much the fascinating nuclear physics of heavy ion collisions at the RHIC experiment at Brookhaven, and the experiments to come on heavy ion collisions at the LHC at CERN. The latter is an aspect of the physics to be done at the LHC that you don’t hear about much because it is sidestepped in favour of discussions about the Higgs, origin of mass, supersymmetry, theories of everything – such as strings, microscopic black holes, extra dimensions and all that other good stuff. (See earlier discussions here, here and here.)

Well, the great thing is that there’s been plenty of discussion of black holes, extra dimensions, strings, and so forth at the conference because of a great deal of promise of its relevance to nuclear physics. It’s been right alongside the discussion of experimental results, and other theoretical approaches such as work on computer simulations of aspects of QCD (“lattice QCD”) and studies involving other techniques. There’s very much a spirit of open-minded exchange among all the various parties […] Click to continue reading this post →

The Scary Universe?

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Ok, there’s “The Elegant Universe”, and “The Ambidextrous Universe”…. even “Stephen Hawking’s Universe”… and so on for these titles. But how about “The Scary Universe” or “The Dangerous Universe”? (Personally, I wish we’d just stop with the whole “The fill-in-the-blank Universe” stuff, so I probably should have not written this first paragraph.)

Well, I myself don’t think of the Universe that way, but tonight (at 9:00pm) the History Channel will be presenting the next show in their series (called “The Universe”), which is about (they say) the Most Dangerous Place In The Universe”. It looks as though it will be a survey of various places where a lot of very energetic activity is taking place, powering some of the most powerful phenomena we’ve ever seen, such as quasars, magnetars, and so forth. So black holes will feature quite a bit, I imagine, and although I probably should not really be telling you about it before I’ve had a chance to see it (recall my remarks about the windy shooting conditions here), I think (I’m not sure) that I’ll be making an appearance as one of the contributors. (I did not get caught off guard this time.)

The whole “dangerous” motif is a sort of deliberately sensational way of presenting […] Click to continue reading this post →

Brain Building

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homersimpson wallpaper brain from http://www.simpsonstrivia.com.arI’ve been sitting here for the whole evening building a set of slides for my talk here at the Cambridge conference (that I still have not got around to telling you about because I’ve been, well, attending it). My talk is at the start of the Wednesday session and so I’m starting early (yeah, I know) so as to build up all the introductory slides with the fancier graphics to lull the viewer into that comfort zone before bombarding them with technical results. You may well know the sort I mean.

(image above right: click-to-enlarge-able “scan” of Homer Simpson’s brain, which I got from here.)

Anyway, I was sitting here thinking that what I could really do with right now (what with the jetlag, the sitting through five one hour talks – all great) is a rapid hike up to the top of Runyon Canyon or up to the top of Mount Hollywood in Griffith Park – two of my favourite pick-me-ups (or is it picks-me-up…?). This would get the blood flowing and give me that jolt I need to stay smart and alert for a few more slides before packing in for the night (and then panicking tomorrow that I did not do enough). All of this was running through my head when an email arrived* with this article about how exercise can boost mental function – actually promote the growth of new neurons. The studies […] Click to continue reading this post →

So in SEED…

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seed august coverMy hand hovered over the August issue of SEED last night in the magazine section of a bookshop. I was not really sure whether I was going to buy it or not, to be honest. Then I glanced through, and two things made me go for it. The first was seeing that there’s something on Chuck Hoberman. I love his designs and constructions, and am dismayed by the fact that they are not just everywhere in our cityscapes. The second was a photograph. There’s some extracts from the collection of photographs of Nobel Prize winners […] Click to continue reading this post →

Perseids!

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Over the next few nights, you should have a good chance of seeing some of the Perseid meteor shower. They’re going to put on a rather splendid show this year, I hear. From the NASA news site, I’ve grabbed a a diagram of the region of the sky (containing the constellation Perseus, of course – that’s where they’ll seem to be coming from, and so that’s what gives them their name) that you ought to be looking toward. (The red dot is not a star, but the central point of (apparent) origin, and the red lines are some example paths of the streakers that you’ll see):

perseids where to look

Concerned that you don’t know enough astronomy? No idea in any amount of detail […] Click to continue reading this post →