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In the theory, "E" is energy, "m" is mass and "c" is the speed of light squared. The formula is known as the mass-energy equivalence as it describes the
relationship between mass and energy. You can now listen to Einstein himself explain E=mc2 in an unearthed clip of the theoretical physicist. The clip was shared online by ZDNet columnist
Vala Afshar, who tweeted: "It is incredible to hear Albert Einstein's voice as he explains his famous formula, E=mc2." In the video, Einstein describes how matter and energy
are virtually the same thing and you can convert one into the other using his formula.