What was the Ice Age? How do we know it happened? And will it happen again? This video should by rights be called "The Ice Age Made Easy", but I want to reserve that title for the series of videos I made showing the evidence for our origins. But the principle is the same -- what happened and how do we know. CORRECTION: At 5:55 I called O-16 the "stable" form of oxygen. But in fact, both O-16 and O-18 are stable. I should have said O-16 is the most abundant.
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