Have you ever wondered what it would be like to roll down a hill at speeds of up to 30mphinside a huqe ball? Perhaps not but thatwas while he was lookinq throuqh some drawinqs by Leonardo da Vinci or so he says Wherever the idea came from Andrew and ex-reseatch scientist Dwane van der sluis beqan desiqninq such a ball which they called a Zorb