Originally a comment by Bjarte Foshaug at the Miscellany Room.
People have always noticed that human beings have different innate physical traits. Furthermore, the distribution of these differences is not entirely random. Some of the most obvious (let’s call them “sex differences”) seem to cluster into two sets of traits that tend to go together far more often than expected by chance. One of these sets (let’s call it the set of “male” traits) is clearly more representative of fathers than mothers while the opposite is true of the second set (let’s call it the set of “female” traits). Roughly half the people on the planet have a strong preponderance of traits from the first set, and roughly the other … Read the rest
