Behavior: If It's Tuesday, You Must Be Tarzan

So what are we to make of the scientific study that came out last week showing how women let their biological calendar choose their mate? Maybe this: no matter how highly evolved we think we are, at some level the female of the species, like the male, is still a slave to the brain's prehistoric hardwiring.

According to the study, which was published in the journal Nature, women who are ovulating tend to favor manly-looking men--big jaws, prominent eyebrows, larger overall size--you know, the kind of Tarzan stuff that is supposed to scream virility. During the other three weeks of the...

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