The inspiring image lifted the spirits of a nation—and raised suspicions that it was too good to be true. After five days of ferocious fighting, U.S. Marines raise the American flag atop Iwo Jima’s ...

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Sleep happens in cycles that include three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage, repeated 4 to 5 times nightly. Each cycle typically lasts 90 to 110 minutes. The ...

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