Did you know that if you went back in time to 3000 BCE, to any village on the planet, and approached a person of any race, that this person would probably be your personal ancestor? Did you know that 'every Palestinian suicide bomber has Jews in his past, every Sunni Muslim in Iraq is descended from at least one Shiite, and every Klansman's family has African roots'?
According to recent work by statisticians and researchers, you would only have to go back 2000 to 5000 years to find someone who could count everyone alive today as a descendant. If you go back 5000 to 7000 years, then everyone living today has exactly the same set of ancestors.
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