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You may wonder what a physicist does for fun. For one thing, he plays with string theory. No, this is not a ball of yarn he stole from his cat. String theory has been a darling of physicists since the concept took off in 1984. It is based on the idea that the elementary particles of physics are not points, but are rather vibrations of one-dimensional strings. Different particles are the same strings set at different vibrations. In order to get the string theory to work mathematically, the physicists invented 10 (of maybe 11) different dimensions for the strings to play in, though no one knows what these dimensions are or how they exist.