Venki Ramakrishnan is a Nobel laureate and the author of "Why We Die." He says there's excessive hype around longevity, but there have been some breakthroughs. Ramakrishnan, 72, leads an active life ...

We have all heard the jokes about grandparents waking up before the sun and teenagers sleeping until noon, but science confirms there is truth to the stereotypes. The timing of our sleep is not purely ...

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