In an age of spacecraft and deep-sea submersibles, we take it for granted that humans are intrepid explorers. Yet from an evolutionary perspective, the propensity to colonize is one of the distinguishing characteristics of our kind: no other primate has ever ranged so far and wide. Stunning finds in the Republic of Georgia are upending long-standing ideas about the first hominids who journeyed out of Africa, marking the start of global colonization.
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