Word: wehr
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Dates: during 1980-1989
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...night and can work two or three jobs at once. Latitude appears to be as important as season: the incidence and severity of SAD increase with distance ; from the equator, peaking at around 40 degrees north. "It's as if there's a 'biological equator,' " explains Psychiatrist Thomas Wehr, head of NIMH's psychobiology branch...