For brains, anyway.
RICHMOND, Va. (June 17, 2005) – People with bigger brains are smarter than their smaller-brained counterparts, according to a study conducted by a Virginia Commonwealth University researcher published in the journal “Intelligence.” ...
“For all age and sex groups, it is now very clear that brain volume and intelligence are related,” said lead researcher Michael A. McDaniel, Ph.D., an industrial and organizational psychologist who specializes in the study of intelligence and other predictors of job performance.
Well... duh? Big muscles mean more strength, so these results are pretty obvious. But then, mine is enormous.
Downside: can't wear hats.