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By Karen Hopkin

First Sex, Then Cheating

A love of big questions led Paul Turner to investigate why simple species have sex, with surprising results. Hint: viruses, too, are faced with a prisoner's dilemma.


As a graduate student at the University of California, Irvine, Paul Turner declared he wanted to study vultures. "I had this strange appreciation for carrion birds," he says. "And I thought there must be something special about their digestive system that allowed them to tolerate and maybe even exploit the potentially pathogenic microbes that grow on rotting meat."



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