• NoSpotOfGround@lemmy.world
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    26 days ago

    Your ancestor tree also expands exponentially (almost doubling with every generation), so everyone alive around the year 1250 AD is either one of your ancestors or no-one-around-today’s ancestor (because their line died out).

    We are all related about 30 mothers out.

    • taiyang@lemmy.world
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      26 days ago

      Yeah. I had thought about that, although I realized that it’s probably a little more complex due to genetic isolation; that is, you’ve got inbreeding several generations back, even more so if your ancestors were really quite homogeneous like the Japanese. Like, instead of it being 30 mothers out, it might only be 15 or less within your region.

      • Danquebec@sh.itjust.works
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        24 days ago

        And a pure Native American must have a common mother with a pure Aboriginal Australian about 1600 mothers ago.

  • Iunnrais@lemmy.world
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    25 days ago

    I mean, people kinda are aware of it? We all know our grandparents are old, and that’s just two generations— knowing your great grandparents is considered a rare honor because of how old they must be, and that’s just three. So a long time spanning relatively few people isn’t really a shocking revelation, is it?

    • squaresinger@lemmy.world
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      24 days ago

      That’s also the weird thing about the “experienced” past.

      When we think about what things were like “in the past”, we think of what they were like for the oldest people we know, and if we are lucky we get a couple stories from them about their parents or grandparents.

      So for me, my experienced past ends in 1930.

      The experienced past is the lense through which we see the whole past, even though it’s such a tiny sliver of the actual past.

      Remember this in this context: Whenever someone says “In the past X was always the case”, what they really mean was “For my grandparents X was the case”, and they likely don’t even realize that.

    • squaresinger@lemmy.world
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      24 days ago

      Remember that not everyone is a direct line of first children. The average age of the mother of the birth of A child (contrary to her first child) seems to be around age 30 over most of history according to google.

      Which does make sense if you consider that women would start getting children in their late teens (puberty used to start later) and end getting children in their 40s.

      That’s why for an average generation 30 years is usually taken.

  • rizzothesmall@sh.itjust.works
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    24 days ago

    The song Year 3000 by Busted makes me laugh. They’re like “your great great great granddaughter is pretty fine.” In 1000 years there were only 5 generations? They had an average breeding age of 200?!

  • ExLisperA
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    24 days ago

    Is 80 supposed to be little? I never knew my great-grandparents so I’m only aware of my 2 past mothers. If I knew 10 mothers that would be huge, I would know about the great-grandparents of the great-grandparents of my great-grandparents. 80 is not “only”, it’s beyond comprehension.