re: Everyone alive today has had a living ancestor at every point in history

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he called you a retard because 30 generations back, assuming you have no inbreeding or adultery

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30 generations. Think how far back that is. That's 600 years. 1418, America had not been discovered yet. It's a virtual certainty you have had relations with a 30th cousin. The only ones I doubt that I've had relations with that don't fit this criteria are Asians (lets face it, almost all black people in this country also have caucasian genes in them just from slave owners having sex with them).