Same thinking in a smaller space

Bigger brains really do seem to be smarter brains. But overall brain size isn't the only thing affecting intelligence. Case in point: Gender.

"It is true that women have smaller brains than men," said Sandra Witelson, Ph.D, McMaster University in Canada. "But numerous studies have shown that women aren't any less intelligent overall than men."

That works because male and female brains are built differently, according to Witelson and other researchers. Something about the way women's brains are built allows to do the same thinking in a smaller space.