Last year, scientists announced that a human jawbone and prehistoric tools found in 2002 in Misliya Cave, on the western edge of Israel, were between 177,000 and 194,000 years old.
The finding suggested that modern humans, who originated in Africa , began migrating out of the continent at least 40,000 years earlier than scientists previously thought.
But the story of how and when modern humans originated and spread throughout the world is still in draft form. That’s because science hasn’t settled how many times modern humans left Africa, or just how many routes they may have taken.
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