From time to time, I’ve asked around for a good estimate of how many neurons are in the human brain. Ten billion–100 billion–something like that, is the typical answer I get. But there are actually a trillion other cells in the brain. They’re known as glia, which is Latin for glue–which gives you an idea of how little scientists have thought of them. But without glia, our brains would be useless. Scientists don’t yet really understand all the things that glia do for us, but it looks as if they do a lot–perhaps even processing information in their own mysterious way.

In my brain column in the September issue of Discover, I consider the long-neglected neurological elephant in the corner. Check it out.

[Image from Neurophysiology for the Audiologist]

Originally published August 19, 2009. Copyright 2009 Carl Zimmer.

[Update: See my continually updated edition of this list here.]

Over the past week I held my first real class, teaching a roomful of students writing about science on Appledore Island (along with a few ornithological auditors, shown in this picture of my classroom). They put up with a relentless schedule of researching and writing and ended up with some excellent pieces about everything from robot sharks to the right way to hold a warbler in your hand. I’ll be posting the fruits of their labors in a couple days at Science on Shoals.

Continue reading “The Index of Banned Words”

Patrick, a research specialist in a computational memory lab, writes,

Yesterday, I got my first science tattoo — and first tattoo period — taking inspiration from you and the lovely people in the Science Tattoo Emporium.

Mine is a hippocampal neuron: specifically, a pyramidal cell found in area CA1. It’s been implicated in spatial memory, which is something my lab works on. (In rodent EEG, hippocampal “place response” has been seen in this type of neuron.) But more than that, I find it to be one of those classically beautiful images in science.

Thanks for the inspiration and encouragement. Science nerd pride!

Click here to go to the full Science Tattoo Emporium.

Originally published August 15, 2009. Copyright 2009 Carl Zimmer.

Now these are good office hours. I’m sitting in front of a big tide pool on a hot day at Appledore Island. My children are playing some Byzantine game involving princesses on the raft in the middle of the pool. A student of mine has just walked passed me, snorkel and goggles in hand. “I’ve just sent you an outline for my project, and I’m going to take a break,” she says. As she floats off to gaze at the algae and the crabs, I use the awesome wireless on this island to check my email. The outline is in my inbox. So by the time she’s done snorkeling, we can discuss it.

I’m doing my best to counter this tranquility by editing these students nearly to the point of tears. But my impersonation of John Houseman in the Paper Chase just can’t measure up on a day like this.

Originally published August 15, 2009. Copyright 2009 Carl Zimmer.