Impossible Feats

S3 E1: It is said that fleas can jump the equivalent to us leaping over St. Paul's Cathedral and it is famously quoted that cheetahs can run at speeds of 70 miles per hour. But are these claims really true? The discovery of the world most elastic natural protein in insects and the development of a hi-tech tracking collar have helped to reveal the facts. So can these creatures really achieve what should be physically impossible?