Legend has it that Isaac Newton had the moment of inspiration that would lead to his theory of gravity when, on a warm afternoon, he saw an apple fall from a tree and wondered why it should fall down ...

These gravity-defying spots remind us how much wonder the world holds. But there are places around the world where this fundamental law of nature seems to defy itself. These spots, known as “gravity ...

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Keeping an orbiting satellite in the proper attitude is no mean trick. But there are times when antennas and cameras have to be kept pointing continually at the earth if they are to work effectively, ...