With 25 hands-on activities that include connections to toys, sports, and everyday items such as scales, elevators, and water towers, this project book helps young scientists explore the invisible but powerful force that is responsible for keeping the universe in place. By creating a working model of a scale, readers will learn what weight really means and how it is affected by gravity. By playing with various weights to make a marvelous mobile, readers learn about center of balance and how martial artists use this knowledge to throw their weight around. Additional activities show how gravity affects the human body, plants, and even electricity. The book is rounded out with a chapter on how to use antigravity forces, including air pressure, buoyancy, and thrust. Grades 2–4.