Was There a Civilization on Earth Before Humans?

Was There a Civilization on Earth Before Humans?

It only took five minutes for Gavin Schmidt to out-speculate me. Schmidt is the director of NASA’s Goddard Institute for Space Studies (a.k.a. GISS), a world-class climate-science facility. One day last year, I came to GISS with a far-out proposal.

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civilization history prehistoric civilization