Sandy is peeking at and playing with Jim Watson’s most intimate bits. So can you!
Pharyngula
Evolution, development, and random biological ejaculations from a godless liberal
Sandy is peeking at and playing with Jim Watson’s most intimate bits. So can you!
Here is an excellent article on the biology of sexual orientation. We all know this is a contentious issue — are we born with an orientation, or is it a ‘choice’ that people make? — and the article just lays the facts out for us and points out some of the lacunae in our knowledge.
Despite a miserable red-eye flight — I left San Jose at 6:30 last night, and arrived in Minneapolis at 4am, followed by my familiar long drive home — I’ll try to say a few words about Sci Foo.
Short version: weirdest meeting ever. That’s a good thing, though.
I’ve got to get back to my meeting, but Cosma just had to distract me with these classic video clips on dissecting the squid giant axon, including movies of one of my personal heroes, JZ Young (pronounced, as everyone knows, as jay-zed), in action. It’s beautiful stuff.
Abbie of ERV has made her first guest post on the Panda’s Thumb, and it’s a good one. Go see how Behe was wrong and there are documented genetic and biochemical changes in the evolution of HIV, including the evolution of new molecular machinery.
My last Seed column is online. Print media feels a little weird — it’s like I wrote that one long ago, the one I finished earlier in July is going to print right now (and will be out in mid-August), and I’m already working on the column after that. It’s like looking at old history for me.
It’s also an old story for you subscribers. It’s just those who haven’t subscribed yet who are months behind the times. So when are you people going to join the rest of us…in the future?
Since I was asked what a cnidarian “head” is in reference to this work on multi-headed cnidarians, I’ll answer. In short, they don’t have one.
This is a short video clip of myotome formation in a zebrafish embryo — it’s the subject of an upcoming column in Seed, so I’m putting a short visual aid here.
You can Download the Quicktime movie (620K), or you can watch it via YouTube. Watch closely, it’s short and it flies by!
I’d reconciled myself to the fact that the sun will die in about 5 billion years — time enough to get all the important stuff done, I thought — but now Chris Mims tells me we’ve only got 12 million years. I mean, that’s like going to the doctor, and he says, “Good news, Mr Myers, you’re going to live to be 90” and then he calls you up a little later and says “whoops, little slip up there, you’ve got a month to live.” It’s not good news.
The story is a bit speculative—we’ve long known that there are these very rough periodic extinctions in the fossil record, and now a few wild-eyed theoreticians suggest that it might be correlated with our system’s rotation around the galaxy, and every 60 some million years we swing around to the side that’s getting zapped a little more heavily.
Just to throw a little restraint into the guesswork, though, the mass extinction data shows considerable variability, and also the idea that we’re going to get irradiated is a little excessive. Passage through the rough side of the galaxy would be an event spanning millions of years: the earth was not sterilized in previous events, but if this were the cause, it would mean that there would be a low level increase in radiation over a very long period of time that would have stressed life to varying degrees. We do have 12 million years to manufacture lead-lined umbrellas and try to develop cosmic-ray resistant wheat. I’m just going to have to trust my great600000th-grandchildren to get their act together in time.
High school education makes a difference, but not quite in the way I’d hoped or expected. A recent correlational study looked at the effects of more discipline-specific education at the high school level on grades in college. That is, if a student took heaps of physics as a high school student, how much will it help her in biology, chemistry, and physics? We’d expect that it should help the student perform better in college physics — she has a head start, after all — but one might naively hope that better mastery of a foundational science like physics would also help with chemistry and biology. On the other hand, perhaps bulking up on biology in high school wouldn’t help much at all with physics. Let’s look and find out!
The results are a little disappointing: there isn’t much of a cross-discipline effect at all. You might be a physics wiz in high school, but it doesn’t mean you won’t be floundering in college biology. Here’s the summary chart, which isn’t particularly well-designed, but you can puzzle out the meaning. They looked at performance in three college disciplines, biology, chemistry, and physics, and correlated it with how much high school biology (orange), chemistry (green), and physics (blue) that the students had taken.
Look at the first orange bar. That’s saying that students who had taken a year of biology in high school had a greater than a full grade point advantage over students who had taken no high school biology. A year of high school chemistry gave only a half-point boost in biology, while high school physics only nudged up biology scores a little bit. It’s not just that high school physics is worthless, either — look at the blue bar on the far right. High school physics was as effective at prepping students for college physics as high school biology was at prepping students for college biology. (The middle blue bar for college chemistry is a little troubling: more physics in high school hurts your grade in college chemistry. We shall console ourselves with the immensity of the error bars.)
Oh, and the gray bars in the graph? That’s math. Math is the #1 most effective preparation for doing well in all sciences, across the board; the more math you can get in high school, the better you’re going to do in any science class you might want to take. Look at those giant gray bars — it makes almost a 2-grade point difference to be all caught up in math before you start college. Parents, if you want your kids to be doctors or rocket scientists, the best thing you can do is make sure they take calculus in high school. Please. Failing to do so doesn’t mean your kid is doomed, but I can see it in the classroom, that students who don’t have the math background have to work twice as hard to keep up as the students who sail in with calculus already under their belt.
It’s why that xkcd cartoon to the right is so perfect. (It’s so good it almost — almost — makes up for this one).
Sadler PM, Tai RH (2007) The Two High-School Pillars Supporting College Science. Science 317(5837)457-458.
