Word: mc2
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Dates: during 1945-1945
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...conversion of mass into energy, Einstein wrote what is probably the most important equation ever devised by man: E = mc2. This means simply that energy is equal to mass multiplied by the square of the velocity of light. Light's speed is so enormous" (186,000 miles a second), and its square (self-multiplication) so much more enormous still, that one pound of matter is equal to more than ten billion kilowatt-hours of energy...