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Science 25 April 1997:
Vol. 276. no. 5312, p. 535
DOI: 10.1126/science.276.5312.535b
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Research News

Ann Gibbons

It's an evolutionary riddle: Why do women live so long after they stop reproducing? A study of African hunter gatherers suggests that women live to a ripe old age to make sure their grandchildren eat. By provisioning grandchildren, grandmothers ensure the children's survival, boost their daughters' fertility--and improve the chances that their own genes are passed on.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)