It turns out we seriously underestimated the central nervous system. It's hard to say what's crazier: the fact that Tufts University researchers spent a year cutting out the tiny eyeballs of tadpole embryos and sticking them back on to the tadpoles' tails, or: the fact that, when they hatched, a few of the tadpoles COULD ACTUALLY SEE OUT OF THE EYES ON THEIR TAILS. As you know, this is not the way vision is supposed to work--your eyeballs are supposed to be connected to a big fat nerve that carries incoming signals back to your brain, which combines the information...