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Leonard Hayflick, Who Discovered Why No One Lives Forever, Dies at 98

A biomedical researcher, he found that normal cells can divide only a certain number of times before they age — which, he said, explained aging on a cellular level.

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A Bird’s Brain Holds Clues to the Sounds of Music

The neurobiologist Erich Jarvis studies the few species capable of speech. He has long hoped to genetically engineer an animal that can make...

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