While I can’t throw like the gangly demon I once was, I still do it. Not too many times. If you really zing it, no telling what might happen to your rotator cuff. Still, it’s wonderfully...grounding? (Interesting word, as if we intuitively know that good contact with the ground is a source of wellbeing.) The archaeological evidence that our ancestors were skipping rocks before the invention of the bow and arrow is slim, possibly because the dimples left on the water by a stone don’t make good fossils. But I’m convinced—as only a man with no proof whatsoever to back up his theories can be—that it might be one of the first forms of entertainment our species invented. If we could knap effective hand axes more than a million years ago, we could certainly skip rocks.