and Benedum Hall of Geology. The museum's Powdermill Nature Reserve was established in 1956 to serve as a field station for long-term studies of natural populations, and now forms the core of the museum's Center for Biodiversity and Ecosystems. Research teams including Carnegie scientists have made discoveries such as Puijila darwini, Castorocauda lutrasimilis, and Hadrocodium wui. Carnegie Science Center Opened in 1991, but with a history that dates to October 24, 1939, the Carnegie Science Center is the most visited museum in Pittsburgh. The Carnegie Science Center houses the Buhl Planetarium, the Rangos Omnimax Theater, SportsWorks, the Miniature Railroad & Village, the USS Requin, a World War II submarine, Bricksburgh, H20h!, and SpacePlace, and Roboworld. On February 21, 1990, Pennsylvania Senator John Heinz introduced Senate Bill S. 2151, which allowed the USS Requin to be transferred as an exhibit for the Carnegie Science Center. The purpose of the exhibit is for visitors to learn how people lived and worked on the boat. The Buhl Planetarium and Carnegie Science Center merged in 1987 and in October 1989, the organizations broke ground on the new Carnegie Science Center building. References External links Andy Warhol Museum Carnegie Museum of Art Carnegie Museum of Natural History Carnegie Science Center Andrew Carnegie Pittsburgh History & Landmarks Foundation Historic Landmarks Museum organizations Museums in Pittsburgh Individually listed contributing properties to historic districts on the National Register in Pennsylvania National Register of Historic Places in Pittsburgh