Flipboard News DeskEver since scientists discovered that most people on Earth have a small slice of Neanderthal in their DNA, they have been trying to figure out when and how it got there. Now, two research groups say humans interbred with Neanderthals for a limited period about 50,000 years ago as our ancient ancestors migrated out of Africa. But why did Neanderthals die out while humans survived? Read more from @NBCNews.
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