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Tracing your family tree far into the past presents a conundrum: you'll eventually have more distinct ancestors than people who have ever existed on Earth. This tells us that not all ancestors are distinct! More were shared the farther back you go, and researchers believe that the whole of current humanity's common ancestor could have existed as recently as 2,000 years ago. Geneticists also postulate that 2,000 years in the future, it's likely that Earth's population will be "descended from most of us." We've collected some awesome videos on this topic. Watch them now to learn more.

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