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Why do we grow old and die? In the 19th century, German biologist August Weismann argued that the machinery of life inevitably wore out with time. Death had evolved “for the need of the species,” he declared. It cleared away weak, old individuals so they wouldn’t compete with young ones. Sign up for The Morning newsletter from the New York Times That explanation never made sense to George Williams, an American evolutionary biologist. Natural selection acts only on the genes that are passed down

United statesNew yorkUnited kingdomAugust weismannSteven austadGeorge williamsJianzhi zhangUniversity of michiganUniversity of alabama at birminghamYork times companyChinese academy of sciencesScience advancesUnited kingdom biobankErping longChinese academyNew york times