Kirk Johnson, of the Smithsonian Institution National Museum of Natural History in Washington, is pictured with the museum’s current exhibition of
Kirk Johnson, of the Smithsonian Institution National Museum of Natural History in Washington, is pictured with the museum's current exhibition of dinosaurs. On the right is the cast of a Tyrannosaurus rex. The Smithsonian is acquiring and will exhibit the real bones of a Tyrannosaurus rex on a 50-year loan from the U.S. Army Corps of Engineers. (Washington Post/Sarah L. Voisin)