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The story of Noah may be the best-known, but it’s not the only ancient legend that features a cataclysmic flood. Walter Pitman, a senior scientist at Columbia University’s Lamont-Doherty Earth Observatory, offers a logical reason: Such a deluge really occurred, about 7,000 years ago, creating the Black Sea. The many people displaced by the torrents headed in various directions, taking the tale of the flood with them. In his lecture, “Noah’s Flood: New Discoveries,” Pitman will present archaeological, linguistic, and genetic evidence that the flood helped create a wealth of human cultures that share only a dim memory of the event that forged them. He’ll also sign copies of the book he co-authored on the subject at 6 p.m. at the Hirshhorn Museum & Sculpture Garden’s Ring Auditorium, 7th St. & Independence Ave. SW. $13. (202) 357-3030. (MJ)