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Relativity and the Expanding Universe
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As the 19th century ended, scientists could be happy they’d solved most mysteries of the physical world: electricity, magnetism, gases, acoustics and statistical mechanics, all had fallen before them. They had discovered the X-ray, the electron, and radioactivity, invented the ohm, the watt, the Kelvin, the joule, and the amp. Many people believed there was nothing left for science to do.
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