The Science Guy is now the Married Guy. Bill Nye is officially off the market after saying “I do” to former Washington Post journalist and New York Times bestselling author Liza Mundy in late May, People reported Wednesday. The couple’s love story — which culminated in a ceremony at the Castle Build’s Haupt Garden at the Smithsonian Institute in Nye’s hometown of Washington, D.C. — originated with one of Mundy’s own works, according to the outlet. Mundy, 61, in “Code Girls: The Untold Story of the American Women Code Breakers of World War II” referenced Nye’s mother, Jacquline Jenkins-Nye, who…