But Tianyu is not short on natural history. In one hall alone, 480 dinosaur fossils are randomly placed in glass cases or left in the open air around a room the size of a basketball court, along with Triassic fish and other more recent fossils, primarily from different parts of China. "We are the world's number one," says Zheng Xiaoting, director and keeper of the Tianyu (which means "universe" in Chinese) Natural History Museum's collection of thousands of dinosaur fossils. Though no official records of the collection's number exist, several Chinese paleontologists echo Zheng's claim that Tianyu houses the world's...