Families beware, a Tyrannosaurus rex is running loose at the Discovery Museum Science and Space Center this weekend. As part of the museum's Gee Whiz Geology: An Exhibit About Rocks, Fossils and Dinosaurs that began Jan. 16, the museum is focusing this weekend's activity on the terrifying T-rex. This featured exhibit is geared toward families with kids about 12 and younger, but there is fun for everyone, as visitors will begin their learning adventure tracking down the Tyrannosaurus rex footprints throughout the museum's grounds. Families will learn about these huge creatures together as they move through the museum and interact with exhibits. Beth Callahan, director of marketing and d