How Neanderthal are you?

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Melissa Hogenboom tells Roland Pease that she took a genetics test that looked at tiny snippets of her DNA and discovered that she was 2.5% Neanderthal. She, and many other people, owe their part-Neanderthal nature to an accident of history when thousands of years ago, modern humans ran into Neanderthals somewhere in Asia or Europe. (Image caption: Someone's great great great great great great... etc grandfather © Erich Ferdinand/CC by 2.0)