Super-strength gives the Man of Steel the right amount of muscle to win any tussle. But what gives things strength? And is anyone or anything in our world as strong as Superman? Get ready to find out with the help of the World's Greatest Hero. You'll be amazed by how much you can learn about the science of strength. Super-strength gives the Man of Steel the right amount of muscle to win any tussle. But what gives things strength? And is anyone or anything in our world as strong as Superman? Get ready to find out with the help of the World's Greatest Hero. You'll be amazed by how much you can learn about the science of strength.