So contemplate this: For millions of years, our male ancestors are scampering about, throwing rocks at pigeons, running after baby antelopes and wrestling them to the ground, forming a single line of shouting, running hunters and trying to terrify a herd of startled warthogs upwind. Imagine that their lives depend on hunting skills and teamwork. Much of their culture is woven on the loom of the hunt. Good hunters are also good warriors. Then, after a long while—a few thousand centuries, say—a natural predisposition for both hunting and teamwork will inhabit many newborn boys. Why? Because incompetent or unenthusiastic hunters leave fewer offspring. I don’t think how to chip a spearpoint out of stone or how to feather an arrow is in our genes. That’s taught or figured out. But a zest for the chase—I bet that is hardwired. Natural selection helped mold our ancestors into superb hunters.