"This week, scientists at the Smithsonian's National Museum of Natural History will start unpacking some rare and precious cargo. It's something the Smithsonian has never had before — a nearly complete skeleton of a Tyrannosaurus rex."

"Most people don't know it, but the T. rex that's standing tall in the Natural History Museum in Washington, D.C., is a fake — a cast, a copy of the bones. It's an accurate replica, but for decades the Smithsonian has coveted a real skeleton of a T. rex — the charismatic, 30-foot-long beast that's not only deliciously frightening to contemplate but also fascinating to scientists."

"How did such an animal grow so large? How fast did it run? Was it a predator or a scavenger?"