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nature vs. nurture

Naju Dorma, 73, and Lacuo Dorma, 66, belong to the Mosuo society in China, where grandmothers head up households. They're posing in traditional garb in their village of Luoshui. Karolin Klüppel hide caption

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Karolin Klüppel

In March of 2017, the two sets of Bogotá twins, Jorge, William, Carlos and Wilber (left to right), gathered to celebrate Carlos's graduation. Diana Carolina/St. Martin's Press hide caption

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Diana Carolina/St. Martin's Press
Renee Klahr/NPR