If aliens visited Paleolithic earth and wagered on who’d be top dog a million years later, genus Homo may not have inspired many bets. However, by pooling brawn and brain, we were able to prevail over forms of life larger, stronger, and faster, as well as those endowed with more refined senses of smell, sight, and sound. We triumphed because we are resourceful and creative, certainly, but above all because we are exceptionally social.
