Our species likes it cold. Homo sapiens evolved in — and still inhabits — one of Earth’s rare and fragile ice ages, periods distinguished not by an abundance of saber-toothed cats and woolly mammoths ...
Earth froze over 717 million years ago. Ice crept down from the poles to the equator, and the dark subglacial seas suffocated ...
Ancient rocks once beneath the ocean hold clues of severe conditions unimaginable on today's planet. Artwork showing the Earth during the Cryogenian period. This geologic period lasted from 850 to 635 ...
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