The farther backward you can look, the farther forward you are likely to see.

—Winston Churchill (attributed)

This is like déjà vu all over again.

—Yogi Berra

Albeit likely expressed in different contexts, both Yogi and Winston were imploring all to recall that trite adage we already know: history repeats itself, so if we wish to divine our future, we must know our past. It's an adage that is no less true for the history of Earth as for the history of its people. And so, in this brief essay, I wish to make the single point that—with regard to...

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