When Albert Einstein (1879–1955) was five, his father gave him a compass as a present. Instantly, the boy was transfixed by the needle, which changed direction as he moved the compass about. The idea that there was some kind of magnetic force that operated on this needle, invisible to the eyes, touched him to the core. What if there were other forces in the world equally invisible yet equally powerful—ones that were undiscovered or not understood? For the rest of his life all of his interests and ideas would revolve around this simple question of hidden forces and fields, and he would often
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