The deep connection Einstein discovered between energy and mass is expressed in the equation E=mc^2. Here E represents energy, m represents mass, and c^2 is a very large number, the square of the speed of light. Full confirmation was slow in coming. In Paris in 1933, Irene and Frederic Joliot-Curie took a photo showing the conversion of energy into mass. A quantum of light, invisible here, carries energy up from beneath. In the middle it changes into mass--two freshly created particles which curve away from each other.
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