Smart People Have Big Heads!
Brain size correlates with intelligence, posts FuturePundit, from a McMaster U study:

Brain size matters for intellectual ability and bigger is better, McMaster University researchers have found.

The study, led by neuroscientist Sandra Witelson, a professor in the Michael G. DeGroote School of Medicine, and published in the December issue of the journal Brain, has provided some of the clearest evidence on the underlying basis of differences in intelligence.

The study involved testing of intelligence in 100 neurologically normal, terminally ill volunteers, who agreed that their brains be measured after death.

It found bigger is better, but there are differences between women and men.

In women, verbal intelligence was clearly correlated with brain size, accounting for 36 percent of the verbal IQ score. In men, this was true for right-handers only, indicating that brain asymmetry is a factor in men.

Spatial intelligence was also correlated with brain size in women, but less strongly. In men, spatial ability was not related to overall brain size. These results suggest that women may use verbal strategies in spatial thinking, but that in men, verbal and spatial thinking are more distinct.

It may be that the size or structure of the localized brain regions which underlie spatial skills in men is related to spatial intelligence, as was shown in previous research in Witelson's lab on the brain of Albert Einstein.

In a further sex difference, brain size decreased with age in men over the age span of 25 to 80 years, but age hardly affected brain size in women. It is not known what protective factors, which could be genetic, hormonal or environmental, operate in women.

In the early 90s, when I stayed with Marlowe on Christopher Street for a few months, she had this doorman from some Carribbean island who spoke almost no English. As we were all dressed up and going out the door, we'd each point to ourself and ask him (as if looking for his approval)..."Head too big for body?" He'd always say the same thing: "Oh, yesssss, lady! Yessss!"

The fun didn't last. I had to move out after Marlowe's Lorikeet, Otto, tried to rape me. And I'm not even kidding. (I think he was beside himself about the red hair, seeing a giant girlfriend opportunity in me.) On the day of the incident, I actually had to barricade myself in the bathroom, where he chased me, until Marlowe got back from the deli.

When Otto wasn't on the make for me, he was often on the telephone. Marlowe trained him to say "guten tag," and a bunch of other things, and when he answered the phone, people sometimes thought it was us. For a little bird with a little blue head, he came off as pretty clever.