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When you log 25 years as a museum photographer, your bosses don’t throw you a party, they give you an exhibition. National Museum of Natural History shutterbug Chip Clark celebrates a quarter century of in-the-field and behind-the-scenes snapping with “Natural Selections: Museum Photography by Chip Clark,” a career- and globe-spanning exhibit of 33 large-scale digital prints, from dramatic underwater work by the crack scuba diver to carefully constructed studio shots of the museum’s gem collection, some utilizing innovative techniques he developed especially for the task. Clark will be on hand to show additional slides and discuss his career at 2 p.m. today and Aug. 11, 18, and 25 (the exhibit runs through September 7) at the National Museum of Natural History’s Special Exhibitions Gallery, 10th & Constitution Ave. NW. Free . (202) 357-2700. (DS)