I have a couple of things in the mental queue for this week, but I'm still playing catch-up from my trip to Texas, so instead you get a really quick comment on last night's Cosmos. This one was all about the history of the Earth-- continents moving, climate changing, mass extinctions-- stuff that I know in outline, but not detail. It was, by and large, far enough from my areas of expertise that I can't say much. I did think that some parts of it were a little too pat, though. These fall into two categories: just-so stories, and things obvious in hindsight. The former includes the very…

Below you'll find the slides from my Physics Day presentations at Space Center Houston, embedded via SlideShare. I was doing the TED-style minimal text thing, so they're probably not all that comprehensible on their own. The event was supposed to have a pop-culture connection, so I decided to use space travel and extrasolar planets as a hook for talking about relativity, thus all the movie images near the beginning. The original idea I had was to look at different fictional ways of evading the ban on faster-than-light travel, but they wanted something more in the half-hour range than the hour…

My Thursday presentation here in Houston went well, though it was a pretty small crowd. I'll be doing it again today before running to the airport to get home. I didn't really have an opportunity to do shameless self-promotion regarding the new book, but I did get a copy of the official cover for it, which you'll see above if you're looking at this on the blog, or below if you're reading via RSS. I don't have a very detailed schedule for the rest of the process, but the target on-sale date is in early January 2015. Which probably dashes my dream of getting on the Colbert Report, but I'll…

One of the pop-physics books I've read recently was Amanda Gefter's much-discussed Trespassing on Einstein's Lawn. I was going to post a review of it back in March, but literally the day I was planning to write it, I got email from an editor at Physics Today asking if I had any books I'd like to review for them. So it ended up there instead of here: Amanda Gefter’s Trespassing on Einstein’s Lawn comes with a super-sized subtitle: “A Father, a Daughter, the Meaning of Nothing, and the Beginning of Everything.” It’s a mouthful, but also rather fitting for a book that manages to be many things…

I had hoped to have another post or two scheduled for the end of this week, but The Pip got some kind of stomach bug, and threw everything into disarray. And tonight, I'm flying to Houston to give a couple of talks as part of Physics Day at Space Center Houston. Life being what it is these days, I'm still fiddling with the talk, so I don't have time to get any more big blog posts done. If you're in the Houston area and free in the middle of the day Thursday or Friday, come by the Space Center-- I'm talking at noon both days. If you're not in Houston, or not free at lunchtime, well, I'll…

Before going to the playground Saturday to investigate non-intertial frames, SteelyKid and I went over to campus to do some experiments in relativity. Galileian relativity, that is: What you see here is SteelyKid sitting on a rolling lab cart with a camera bolted to it. She throws a ball up in the air a couple of times with the cart at rest, then I start pushing it across the room, and she tosses the ball a few more times. You can see from the video that, other than the motion of the background, the two cases look very similar. This is a demonstration of the principle of relativity, which…

The Schenectady JCC, where SteelyKid and The Pip go to day care, has a playground with a merry-go-round on it. How this hasn't been sued out of existence, I have no idea, but it's a great boon to a physics professor. I've used it before to talk about angular momentum, but this weekend I enlisted SteelyKid's help to make a video illustrating a different sort of physics with the merry-go-round, a camera, and a tennis ball: As you can see in the video, when the merry-go-round isn't moving, the ball rolls straight, but when it's spinning, the ball follows a curved path. This is a striking…

Back when the first episode of the Cosmos reboot aired, somebody put together a composite of the cartoon people who flashed on screen, and we played a guessing game on Twitter. The image above is from a blog post by Meg at True Anomalies, and I think it was probably her, but the ephemeral nature of Twitter makes it annoying to track down the original discussion. Anyway, we collectively got four of the five right: ibn al-Haytham in the upper left, Annie Jump Cannon in the middle top, Isaac Newton on the lower left, and William Herschel on the lower right. Well, five of six, if you include…

While I'm complaining about statisticulation in social media, I was puzzled by the graph in Kevin Drum's recent post about college wage gaps, which is reproduced as the "featured image" above, and also copied below for those reading via RSS. I don't dispute the general phenomenon this is describing-- that the top 10% of college grads earn way more than the average, and the bottom 10% way less, and somewhat less than high school grads-- but I'm baffled about what was done to generate this graph. Specifically, I'm puzzled by the vertical axis, which is labeled "Real hourly wage (natural log)."…

Via a mailing list, probably via this Tyler Cowen post, an awful statistic about adjunct faculty: 35 years ago there were 44% more tenured faculty than adjuncts. Today there are 76% more adjuncts than tenured faculty, via @chronicle — Ángel Cabrera (@CabreraAngel) April 25, 2014 This is awful in two ways. First, it's obviously a sad comment on the state of the college teaching profession. More importantly, though, it's a classic abuse of statistics, using a really confusing presentation of the numbers to exaggerate an effect that doesn't really need it. Here, let's try this as a poll, since…

A collection of miscellaneous stuff with an academic inclination from the past week or so: -- We gave an exam last night in introductory E&M (I'm teaching one of five sections this term), so we've spent a lot of time this week on exam review. One thing that might be worth mentioning here is the way I run review sessions, which I don't think is entirely original to me, but which generally gets a "Huh. That's a good idea." when I explain it to other faculty, so wherever I got it from isn't well known. What I do is: at the start of the review session (either a regular class period given over…

The finalists for the 2014 "Flame Challenge" have been selected, three written entries and three visual entries. None of these is my entry, alas, but it was worth a shot. I watched the videos last night, and it was sort of interesting to compare what ended up working well with the test audience of 11-year-olds to the comments that I got. The main difference between what I did and what got picked wasn't so much in the use of unfamiliar words (the thing that generated comments on my post), but in the use of 11-year-old humor. (To be honest, I kind of hate one of them, because it overdoes the…

"DAAAAADDDDDYYYYY!!!!" "What's the matter, honey?" "I don't like being alone." "Well, I'm sorry, honey, but I have work to do, and it's time for you to go to sleep." "But when I'm alone I get scared." "Well, I can put on some music if you like. You can listen to that, and it might give you something else to think about." "Yeah, put the music on." "I don't know if you've noticed, but when I sleep, I always put music on, because it helps me feel less lonely." "The music helps, but I still worry about things. Like bad guys. And the evil snakes from Lego Ninjago. I worry that they might be around…

The kids spent last week at Grandma and Grandpa's, as school was closed for Passover/Easter (best wishes for each of those holidays to those who celebrate them), and Kate and I went down there for the weekend. During which trip we went up on top of the flood control dam in town, and flew a kite, as you can see in the "featured image" above, or the copy of it below: SteelyKid, flying a kite. SteelyKid had a great time flying the kite, and played out so much string that you can barely make out the kite in the photo, even after a bit of image processing to enhance it. And, for balance, here's…

Astonishingly, in the last few weeks, I've actually found time to read some-- gasp-- novels. In particular, I finished two books that probably belong in the "Hard SF" genre: A Darkling Sea by James L. Cambias and Lockstep by Karl Schroeder. Both Jim and Karl are people I've met many times at cons; I've enjoyed a lot of books by Karl, but this is Jim's first published novel (I think). I'm lumping these together both because it's rare for me to get time to read, let along booklog stuff, but also because there's a sense in which they're complementary books: Both offer thoroughly fascinating far-…

As I've mentioned here before, I do a lot of work these days in my local Starbucks. This is slightly ironic, as I don't like coffee-- instead, I order tea, which I put in an insulated travel mug. I tend to get the tea, carry the mug back to the table, and let it steep while I boot up the laptop, then pull the teabags out. I get a hot water refill after I finish the first mug, and take it over to campus if I'm going in that day, and those generally carries me through the morning. At some point, I noticed that when I had the cap on, I tended to end up with a small puddle of liquid next to the…

The last couple of days have been ridiculously hectic, but Rhett and I did manage to record another episode of Uncertain Dots, our twelfth: This time out, we talk about labs, undergrad research, kids doing chores, weather, student course evaluations, and I didn't really rant about superheroes. Relevant to the weather thing, I offer the "featured image" up top, showing last night's snow at Chateau Steelypips. Spring in New England, baby!

I'm not really a comic-book guy, but I've watched a bunch of comic-book movies recently. Kate was really fired up for the new Captain America movie, so I finally got around to watching the first one as background for that, then when I was sleep-deprived last week I watched the second Thor movie via on-demand cable, then Sunday evening Kate and I went to see Captain America: The Winter Soldier in the theater (her second time watching it-- she's really fired up). Mostly, this has served to confirm that I'm not a comic-book guy. I'm just not invested enough in the idea of a movie about these…

A diabolical psychologist brings a mathematician in for an experiment. The mathematician is seated in a chair on a track leading to a bed on which there is an extremely attractive person of the appropriate gender, completely naked. The psychologist explains "This person will do absolutely anything you want, subject to one condition: every five minutes, we will move your chair across one-half of the distance separating you." The mathematician explodes in outrage. "What! It'll take an infinite time to get there. This is torture!" They storm out. The next experimental subject is a physicist,…

One of the weird quirks of Union college, where I teach, is that the hockey teams compete in the NCAA's Division I, something that doesn't usually happen for a school with only 2200 students. That might seem like a ridiculously terrible idea, but last night, it worked surprisingly well: Union beat perennial hockey power Minnesota for the NCAA National Championship. It was an amazing game I'm not going to pretend like I'm a huge fan-- Kate and I watched on tv, the only hockey I've watched all season-- and I'm certainly not going to use first-person pronouns to talk about it (I really hate that…