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In recent kiss-and-tell memoirs, ex-Star Trek regulars have hurled darts at the show’s late creator, Gene Roddenberry, accusing him of exploiting fans with cheap knickknacks and romancing several cast members simultaneously. In Gene Roddenberry: The Last Conversation, author Yvonne Fern—who spent seven months in Roddenberry’s home as “official biographer of his vision”—explores his philosophic side. Today, Fern will sign copies of her book, which reportedly contains a discussion of Star Trek as a surrogate Mass with Spock standing in for the Holy Ghost. As the Vulcan science officer would say with arched eyebrow: fascinating. At 1 p.m. at the National Air & Space Museum, 6th & Independence Ave. SW. FREE. (202) 357-2700; Thursday at 7 p.m. at Borders, 1801 K St. NW. FREE. (202) 466-4999. (Greg Kitsock)