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We’d all be happier if we followed the example set by cats. My cats, who are otherwise lacking in motivation and practical skills, have learned to manipulate every curtain and blind in the house to get to the sunshine. At night and on gloomy days, they hunker down under the nearest lamp, sometimes poking their heads up under the lampshades like drunken ’50s conventioneers. And they’re never depressed. For some non-feline beings, the short days and long nights of winter pose a serious risk: Some 35 million people suffer from seasonal affective disorder (the aptly abbreviated SAD), and a lot more of us just really start to drag. Norman E. Rosenthal, a professor of clinical psychiatry at Georgetown Medical School, discusses light therapy, pharmaceuticals, diet changes, and other treatments for seasonal depression in “Seasons of the Mind: Beating the Winter Blues.” At 6 p.m. at the Hirshhorn Museum and Sculpture Garden’s Ring Auditorium, 7th and Independence Avenue SW. $13. For reservations call (202) 357-3030. (Pamela Murray Winters)