Gravity is an ever-present force in our lives. It does lots of useful things-like keeping us on Earth and holding the entire universe together! Read about the scientific quest to understand the mysteries of gravity, such as how it affects the movements of the planets and helps us make power from waterfalls. -- Provided by publisher.

What did gravity ever do for you? -- It started with a bang! -- How fast will you fall? -- What did the apple do to Newton? -- Why is gravity like a hole? -- Putting gravity to work -- What goes up but doesn't come down? -- Your body loves gravity -- Too much of a good thing? -- Life without gravity -- Fighting back -- So, could you live without gravity?