Gravity : mass, energy, and the force that holds things together, with hands-on science activities for kids
"Explore the invisible but powerful force that is responsible for keeping the entire universe in place--including you! Gravity is the natural phenomenon that makes everything in the universe attracted to everything else. On Earth, that means gravity is why we fall down toward the ground, the reason we have tides, and why we weigh a certain number of pounds"-- Back cover.