“Today’s human population is descended from twice as many women as men. I think this difference is the single most under-appreciated fact about gender. To get that kind of difference, you had to have something like: throughout the entire history of the human race, maybe 80% of women but only 40% of men reproduced.

We’re descended from women who played it safe. We’re most descended from the type of men who made the risky voyage and managed to come back rich.