• Knock_Knock_Lemmy_In@lemmy.world
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      7 hours ago

      The movie doesn’t imply 100%.

      The hypothesis they use is that stupid people have more kids and become the majority. It shows the genetic selection occuring over many generations.

    • AA5B@lemmy.world
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      7 hours ago

      Add in the effects of poverty, poor nutrition, lack of education, then top off with peer pressure and you get close to 100%