Many millennia ago, the tides turned for ancient Sumerians who built the first civilization - literally. Rising in southern Mesopotamia around 6,000 years ago, Sumer bridged a network of city-states ...
(via PBS Space Time) We’re almost certainly the first technological civilization on Earth. But what if we’re not? We are. Although how sure are we, really? The Silurian hypothesis, which asks whether ...
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