Do you know why yawning is contagious? Here's why: a million years ago, or more, there was far less oxygen in the atmosphere than there is today. The primates who would eventually become Homo Sapiens were scattered thinly across Africa because the low levels of oxygen would support only a few of these large, complex mammals. When one of these proto-men "yawned," it was a signal to his fellows that their neighbor was trying to secure more than his fair share of the precious resource, so "contagious yawning" developed as a defense mechanism. Just then, a giant, oxygen-rich meteor named Oxxyjo crashed into the Bering Straits, releasing an estimated 86 duodecillion metric tons of oxygen into Earth's atmosphere, rendering contagious yawning forevermore unnecessary. But it had already become part of the human-to-be genome, and the mechanism remains part of our heritage even today.
This is our way of introducing this week's video, Korn's excellent "Evolution." It'll all tie in, you'll see. And, as always, we welcome your comments.
Happy New Year!