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wat
(copied from Reddit)
Your family trees severely collapse when you look back a reasonable (<50) number of generations. I hope this explanation is clear:
You have two parents, four grandparents, eight great-grandparents, and so on. In general, if you look n generations back, there are 2^(n+2) people who are your (n-great)-grandparents.
Let's generously say a generation is 30 years. If you look back 40 generations, to around the year 800 C.E., you have 2^42 (40-great)-grandparents. That's well over four trillion people, more people than were alive in 800 C.E. by several orders of magnitude. More people than have ever been alive.
The reason this is possible: If you looked at a list of your 2^42 40-great-grandparents, you'd see duplicates. In fact, each name would show up around 10,000 times, possibly even more. So your (mom's mom's dad's mom's ... dad) is the same as your (dad's mom's dad's dad's ... dad), and in fact your can trace your ancestry to that guy in about 10,000 different ways.
wat
Um, ok.
where's the interesting part?
Basically what CH is saying is that once you get a certain number of grandparents back we all start sharing branches. My like 14th great grandfather is Prince William's 12th great grandfather who was also Nathianiel Hawthorne's 4th great uncle or something. So we are all interconnected.
I don't think there is.
Not only that, but we all came from historically an extremely small genetic pool.
we all came from rib woman
inb4 mouses "darwin lovers" rant
So we all related. We are all inbreed freaks.
Sounds right.
All in the family
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