Those highs and lows? They’re from the circadian rhythms that influence everything from our body temperature to moods, appetite, and sexual desires.

At the heart of it is sleep—and science has surprises that challenge assumptions.

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“There was definitely pain and anger and negative thoughts, but something had happened by people talking and hearing each other,” Rothschild told Nat Geo about rebuilding after the 2018 Tree of Life synagogue massacre. “They began thinking about what comes next … they started to heal.”

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