It is simply not true that scientists talk only to other scientists. In fact, the American Association for the Advancement of Science has invited the public to its national meeting this week to hear lectures and see films on subjects as diverse as infant chimpanzee development and the exploration of Mars. The films, mostly ten to twenty minutes long, run continuously from 10 a.m. to 3 p.m. tomorrow through Thursday, and 10 a.m. to 1:05 p.m. Friday. The lectures are at 1:45 p.m. Monday through Friday, and 8:30 p.m. today through Thursday. While some of the lectures are most likely to appeal to other scientists, two will be of particular interest to the public: Gilbert Grosvenor, editor of the National Geographic, narrating a film devoted to "The Great Whales" (tonight, 8:30); and Jearl Walker of Cleveland State University presenting an introductory physics course as a multimedia show designed to educate by appealing to the aesthetic side of the brain (Thursday, 8:30 p.m.). AAAS national meeting.Sheraton Park Hotel, Shearton ballroom. Lectures February 12 through 16, 18:30 p.m.; and February 13 through 17, 1:45 p.m. Films, February 13 through 16, 10 a.m. through 3 p.m.; and February 17, 10 a.m. to 1:05 p.m. Free. 467-5441.