Sonia Fernandez in brown shirt

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an African baby in his father's arms
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iStock
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sunlight shines through a swimming jellyfish
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iStock
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photo of Tsimane people, left, and photo of Hadza people, right
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Michael Gurven; iStock
Though separated by an ocean for millennia, the rural Tsimané of lowland Bolivia, left, and Hadza people of Tanzania, right, share a remarkable number of gut microbiome species, many of which have disappeared from the microbiomes of people in urbanized societies