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Nature 445, xi (15 February 2007) | doi:10.1038/7129xia; Published online 14 February 2007

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Making the paper: John Tooby

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Pin-pointing behavioural cues that make for happy families.

Do humans behave altruistically towards family members to help to ensure that their common genes make it to the next generation? And are humans somehow wired to prevent incest?