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For an evolutionary biologist, homosexuality is something of a puzzle. It’s a common trait, found in up to 10% of the population. It appears to be run in families, suggesting that it is hereditary, at least in part. And yet it defies the very reason why traits are passed on from generation to generation. How could something that hinders childbearing be passed down so frequently from parents to children?

Researchers at the National Institute for Mathematical and Biological Synthesis (NIMBioS) think they may have an answer.