When Spanish colonizers established a town in the mountains of Bolivia in the 1500s, they might have expected to expand their communities by having babies, but they could not. While Indigenous folks raised families, not a single child of European descent was born for decades. It was all down to the lack of oxygen at altitude, which the settlers were not genetically adapted to deal with. @KnowableMag reports on how scientists are now studying this to see if they can help pregnant people whose bodies are struggling to provide enough oxygen to their fetuses, at any altitude.
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