If Earth Had Only One Man Left
Animated Short, 0:50. Published 2026-11-08.
What if there was only one man left on Earth? Every baby born would be his. Here's what happens to the gene pool, and why humanity would still survive.
Facts: Bennett et al. 2002 (NSGC) on cousin risk; O'Brien et al. 1985 (Science) on cheetah skin grafts; half-sibling children are 12.5% inbred.
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Transcript
If you were the only man left alive on Earth, and everyone else was a woman, you'd have to repopulate the planet. But every baby born would be yours. So most of your kids are half-siblings. And by the grandkids, everyone shares one grandfather. You. When half-siblings have a baby, it's twice as inbred as a first cousins' child.
And cousins' kids already face double the risk of serious birth defects. Because everyone hides a few faulty genes. Inbreeding hands a child two copies. Cheetahs went through this. They're now so alike, unrelated cheetahs accepted each other's skin grafts. The twist? Billions of women keep the gene pool alive. Humanity survives. But for generations, more babies are born sick.
All because of you.
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