Cao Chong Weighs an Elephant

How much does an elephant weigh? How would you know if you didn't have a modern scale? Six-year-old Cao Chong, the most famous child prodigy in Chinese history, faced just this problem! Chong watches as the prime minister s most trusted and learned advisors debate different methods. The principal of buoyancy and a little bit of creative thinking help this boy come up with a solution.