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If I went back 100,000 years and mated with a human, would we produce any offspring? How far would I need to go back before I found an ancestor that is incompatible with modern humans?

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If I went back 100,000 years and mated with a human, would we produce any offspring? How far would I need to go back before I found an ancestor that is incompatible with modern humans?	4660
(Physics) If I flood the inside of a piano with Helium gas, will it sound differently?	1