You don t really get a choice about gravity. If you live on Earth, you re going to have to live with it. If you become an astronaut, you might get to escape from gravity for a while, but it will be waiting for you when you get home. But gravity does a lot of useful things - such as keeping us on the Earth and holding the entire universe together! Learn how gravity was discovered and why it helps us to understand everything from how toothpaste comes out of the tube to the movements of the planets.