Physics
drorzel | January 5, 2011Kate and SteelyKid have colds (well, they're sharing the same cold), so SteelyKid is waking up a lot during the night. Since Kate needs rest as well, she put earplugs in last night (she's a much lighter sleeper than I am), and I took baby-soothing duty. So I was up half the night.
I come in for my 9:15 class, turn on the projector so I can project my slides, and the projector is dead. A bunch of fiddling with it reveals that it's not just a blown bulb (which happened Monday morning), but a broken projector. So, no lecture slides.
"All right," I say, "I'll just do a chalk-talk using my…
drorzel | January 5, 2011Back in the fall, I got an email from my UK publisher asking me if I'd be willing to read and possibly blurb a forthcoming book, The Four Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality by Richard Panek. The book isn't exactly in my field, but there really wasn't any way I'd turn down a request like that. Coincidentally, I received an ARC of the book a few days later from the US publisher. They weren't asking for a blurb, but I'm always happy to get free books.
From the title, I expected this to be another book laying out the now-standard model (if not…
oracknows | January 4, 2011Back in December, I took issue with a highly irritating article by someone who normally should know better, Jonah Lehrer, entitled The Truth Wears Off: Is There Something Wrong With the Scientific Method?, so much so that I wrote one of my typical long-winded deconstructions of the article. One thing that irritated me was contained in the very title itself, namely the insinuation that the "decline effect," which is the tendency of effects observed in early scientific experiments demonstrating a phenomenon to "decline" or become less robust as more and more experiments are performed, is…
drorzel | January 3, 2011The clock in my classroom for this term appears to be set five minutes slow. Which is an improvement over the one in the hall that's ten minutes slow, but kind of plays hell with starting and ending class on time. It is, however, a great excuse for a poll:
Clocks in academic buildings should be set:survey software
Combine the odd clock settings with our daft class schedule (to make our ten-week terms nominally equivalent to standard semester classes, we teach in 65-minute blocks instead of the more typical 50-minute blocks. This means that classes start and end at odd times, which I've…
drorzel | January 3, 2011It's the first day of the new term, and the projector bulb that was working on Friday decided to stop working by Sunday. After that bit of excitement this morning, plus my lecture, I'm beat. I always forget how much talking is involved in intro physics lectures.
My class for the term is the first term of introductory physics, which seems like a good idea for a poll:
What is your favorite part of Newtonian physics?online survey
Given the book we use, "The Momentum Principle," "The Energy Principle," and "The Angular Momentum Principle" would be better names for what I've got in mind, but it'…
drorzel | January 2, 2011Because I'm sure everybody is as fascinated by blog stats as I am, here's the traffic to this blog for 2010, in graphical form:
In case you can't numerically integrate that in your head, I'll tell you that the total number of pageviews represented there is a bit more than 908,000. We have yet to crack the million mark in any one year, but the total number of pageviews over the history of ScienceBlogs is just short of 3.9 million. Not too shabby.
Looking at the overall traffic states for the five years (five years!) that I've been blogging at ScienceBlogs, the thing I'm happiest about is this…
esiegel | January 1, 2011"They say that every snowflake is different. If that were true, how could the world go on? How could we ever get up off our knees? How could we ever recover from the wonder of it?" -Jeanette Winterson
Here in Portland, it's just cold for now. But much of the world has been blanketed in those familiar white flakes, and recently. Snow is one of those simple things that nature just does, but it's still as wonderful for most of us as it was when we were little kids.
Image credit: Fillies Wo/UNEP/Still Pictures.
Rather than liquid freezing, snow comes from water vapor -- the gaseous form of…
esiegel | December 30, 2010"There is only one corner of the universe you can be certain of improving, and that's your own self." -Aldous Huxley
Earlier this week, I told you the story of how we went from a Universe that was -- at one time -- almost perfectly smooth, full of tiny, random fluctuations in density,
to the Universe we have today, full of stars, galaxies, and clusters of galaxies all clumped together in a beautiful cosmic web of structure.
But there was one picture I showed that generated a lot of questions. I put up an image showing what the Universe was made out of today (when we have this great cosmic…
drorzel | December 29, 2010Most of what would ordinarily be blogging time this morning got used up writing a response to a question at the
Physics Stack Exchange. But having put all that effort in over there, I might as well put it to use here, too...
The question comes from a person who did a poster on terminology at the recently concluded American Geophysical Union meeting, offering the following definition of "data":
Values collected as part of a scientific investigation; may be qualified as 'science data'. This includes uncalibrated values (raw data), derived values (calibrated data), and other transformations of…
esiegel | December 28, 2010You may find yourself living in a shotgun shack
You may find yourself in another part of the world
You may find yourself behind the wheel of a large automobile
You may find yourself in a beautiful house, with a beautiful wife
You may ask yourself: well... how did I get here? -Talking Heads
Yesterday's Astronomy Picture of the Day was this beautiful shot of the nearest 1.5 million (or so) galaxies, as mapped by the 2-Micron All-Sky Survey, with our galaxy shaded in blue.
Now, if you're an astrophysicist, you might ask yourself how these nearby galaxies are distributed. Are they regularly…
drorzel | December 28, 2010It's the last week of the (calendar) year, which means it's a good time to recap the previous twelve months worth of scientific news. Typically, publications like Physics World will publish a list of top ten physics stories of 2010, but we're all Web 2.0 these days, so it seems more appropriate to put this to a poll:
What is the top physics story of 2010?survey software
I've used the Physics World list as a starting point, because you have to start somewhere. I added a few options to cover the possibility that they left something out, and, of course, you know where the comments are.
This…
oracknows | December 17, 2010NOTE: Orac was actually out rather late last night. It turns out that the more administrative responsibility he somehow seems to find the more he has to go out to dinner as a part of various cancer center-related functions. As a result, he is recycling a bit of recent material from elsewhere that he in his extreme arrogance considers just too good not to post up on this blog too. In any case, it's always interesting to see how a different audience reacts to his stuff, and he did make some alterations to this post.
'Tis the season, it would seem, for questioning science. Not that there's…
esiegel | December 16, 2010"The most important scientific revolutions all include, as their only common feature, the dethronement of human arrogance from one pedestal after another of previous convictions about our centrality in the cosmos." -Stephen Jay Gould
Tuesday, I talked about an alternative theory to cosmic inflation.
Whereas cosmic inflation gives you a uniform, flat Universe, that's the same temperature everywhere, with a predictable spectrum of fluctuations, the alternative model gave none of those things, but did give those regions of concentric rings with low fluctuation amplitude.
In detail, of course,…
drorzel | December 15, 2010I've mentioned before that I'm answering the occasional question over at the Physics Stack Exchange site, a crowd-sourced physics Q&A. When I'm particularly pleased with a question and answer, I'll be promoting them over here like, well, now. Yesterday, somebody posted this question:
Consider a single photon (λ=532 nm) traveling through a plate of perfect glass with a refractive index n=1.5. We know that it does not change its direction or other characteristics in any particular way and propagating 1 cm through such glass is equivalent to 1.5 cm of vacuum. Apparently, the photon…
drorzel | December 15, 2010As previously noted, the UK edition of How to Teach Physics to Your Dog is selling very well via the Guardian's online bookshop, among other UK venues. It's doing well enough that I might need to start referring to the original text as the American edition of How to Teach Quantum Physics to Your Dog...
There's a nice ironic twist to the Guardian aspect of it, though, in the form of a review by that paper that I hadn't previously noticed until this book business summary brought it to my attention. It's a blisteringly bad review, basically dumping hate all over the talking-dog conceit. Which,…
esiegel | December 14, 2010"Nullius in Verba.
(Take nobody's word for it.)" -Motto of the Royal Society
You know the drill. New ideas come out all the time. Sometimes they're new theories, sometimes they're old theories with a new twist, but regardless, we need to ask the question: How good is your theory?
For whatever it's worth, I came up with a scale for this.
The best ideas are beyond validated. They are confirmed over and over, predict new phenomena that gets verified, and don't have any self-inconsistencies.
Well, a couple of weeks ago, a new twist on an old idea was proposed by Roger Penrose.
A little…
oracknows | December 11, 2010Has it really been six years?
Six years ago today, on a dim and dreary Saturday in December, almost on a whim I sat down, went to Blogspot, and started up the first version of Respectful Insolence with an introductory post with the cliched title, Please allow me to introduce myself. Here it is, six years later. On this cold December Saturday, I still find it difficult to his blog is considered one of the "top" medical blogs by one measure, and some actually--shockingly--consider me somewhat of a "famous" skeptic. I know, I know, I still can't wrap my head around the concept myself. At least,…
drorzel | December 10, 2010I'm currently working on a book about relativity, but I still spend a fair amount of time thinking about quantum issues. A lot of this won't make it into the book, because I can't assume people will have read How to Teach Physics to Your Dog before reading whatever the relativity book's title ends up being, and because explaining the quantum background would take too much space. But then, that's what I have a blog for...
Anyway, the section I was working on yesterday concerned causality and faster-than-light travel, specifically the fact that they don't play well together. Given Tuesday's…
drorzel | December 9, 2010How to Teach Quantum Physics to Your Dog, the UK edition of How to Teach Physics to Your Dog continues to sell very well. The vanity search today led me to this, screen captured from the Guardian newspaper in the UK, which sells our book in its online bookshop:
Woo! Take that, biology!
Yeah, yeah, I should be so lucky as to squeak onto the list in 150 years. Still, it's kind of a hoot to see that list.
drorzel | December 8, 2010The great British physicist Ernest Rutherford once said "In science, there is only physics; all the rest is stamp collecting." This is kind of the ultimate example of the arrogance of physicists, given a lovely ironic twist by the fact that when Rutherford won a Nobel Prize, it was in Chemistry. (He won for discovering that radioactive decays lead to transmutation of elements, causing one contemporary to quip that the most remarkable transmutation ever was Rutherford's change from a physicist to a chemist for the Nobel.)
Of course, there's a little truth to the statement-- not the part about…