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foot racing is a popular activity Foot racing is a popular activity in the United States. Foot racing is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Through serious runners may spend months training to compete, other runners and walkers might not train at all
gravity The answer is gravity: an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall. An animation of gravity at work. Albert Einstein described gravity as a curve in space that wraps around an object—such as a star or a planet
