Introduces gravity， discussing how it works on Earth and in space， and how humans are suited to Earth's gravity.，"What was Einstein's biggest mistake? How does gravity help us keep fit? What is a wormhole in space? To uncover the hidden facts behind everyday things， explore the secrets of True Stories. True Stories reveals the surprising truth about a range of subjects. Discover everything you could wish to know， and some things you'll wish you didn't， about a huge range of topics!"