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In the infamous shower scene from Psycho, the profusion of blood that caused so many nightmares was actually chocolate syrup, which works better on black-and-white film than stage blood. Luckily, nothing so psycho awaits at the Koshland Science Museum’s lecture “The Science of Chocolate.” Harold Schmitz, chief science officer of Mars Inc., provides details on the potential scientific benefits of cocoa, including its role in improving cardiovascular health and the cacao tree’s function in helping to safeguard tropical rainforests. A test of different chocolate brands is a tasteful finish to the evening. The lecture begins at 5:30 p.m. at the Marian Koshland Science Museum, 500 5th St. NW. $10 (advance purchase required). (202) 334-1201. (Kristen Berg)