Science & technology | Human behaviour

Deviations from the mean

Biologists are helping economists to explain why humans are not always selfish

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AT SOME point during their education, biology students are told about a conversation in a pub that took place over 50 years ago. J.B.S. Haldane, a British geneticist, was asked whether he would lay down his life for his country. After doing a quick calculation on the back of a napkin, he said he would do so for two brothers or eight cousins. In other words, he would die to protect the equivalent of his genetic contribution to the next generation.

This article appeared in the Science & technology section of the print edition under the headline “Deviations from the mean”

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