Trauma can affect the body's ability to regulate its stress response, even long after the event has passed, leading to persistent physical symptoms.
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The 1918 influenza pandemic, often called the Spanish Flu, infected an estimated 500 million people—about one-third of the world's population at the time.
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Some longevity research focuses on studying populations with exceptionally high numbers of centenarians (people who live to 100 or older) to identify genetic and lifestyle factors contributing to their extended lifespans.
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