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Study Offers New Twist in How the First Humans Evolved About 600,000 years ago, a small group of humans budded off from Stem1 and went on to become the Neanderthals. But Stem1 endured in Africa for hundreds of thousands of years after that, as did Stem2. https://www.nytimes.com/2023/05/17/science/human-origins-africa.html