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Energy from chocolate
When calculating kinetic energy (work to accelerate a massive body from zero speed to some finite speed) relativistically – using Lorentz transformations instead of Newtonian mechanics – Einstein discovered an unexpected by-product of these calculations to be an energy term which does not vanish at zero speed.
He called it rest energy: energy which every massive body must possess even when being at rest. The amount of energy is directly proportional to the mass of the body.
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