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Where would American movies be without The Godfather? Francis Ford Coppola’s 1972 epic about the Corleone family, based on Mario Puzo’s best-selling book, gave a startling new shape and texture to the mythology behind the American dream: mobster weddings, New York in the ’40s, family loyalties, drug wars, and vengeance with a vengeance (including that memorable horse’s head). The film also launched the career of Al Pacino and paved the way for two superlative sequels (not to mention countless jowly Marlon Brando impressions that still pop up everywhere from Saturday Night Live to Dr. Dolittle 2). Tonight, NIH makes you an offer you can’t refuse: See Brando, Al Pacino, James Caan, Robert Duvall, and Diane Keaton onscreen outside at 8:15 p.m. at the National Institutes of Health, South Drive and Rockville Pike, Bethesda. Free. (301) 496-6061. (Robin Dougherty)