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During the day on Aug. 21, large swaths of farmland will be plunged into darkness, and temperatures will drop about 10 degrees. Scientists are waiting to see how crops and animals react. Daniel Acker/Bloomberg/Getty Images hide caption

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Daniel Acker/Bloomberg/Getty Images

Escaping artificial light even for a winter weekend can reset sleep patterns for the better, researchers say. One good place to do it: Heliotrope Ridge near Mount Baker in Washington state. Christopher Kimmel/Aurora Open/Getty Images hide caption

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Christopher Kimmel/Aurora Open/Getty Images