Posted elsewhere but would like explained like I’m 5.
What I can’t get my head around is: I had 2 parents, they had 4 (in total) who would have had 8 in a geometric progression, so going back even 1000 years or 20 generations (assuming an average lifespan of 50 years) is 2,097,152 ancestors for just me, and given that there is a reported 7.9 billion people on earth alive today it seems mathematically impossible that all those people could have existed.
In: 7
I believe your numbers are wrong. You don’t have kids every 50 years. The kids happen from 10 to 50. Yeah, 10, we hopefully are mostly civilized now, but go back to the past and people where having children a lot earlier. And dying, a lot earlier. So 20 generations could be as early as merely 200 years.
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