I've been thinking about Einstein recently, and I came back to the famous equation e=mc^2. Why does this work? It's saying the difference between mass and energy happens to be the speed of light squared? I'm sure there's a larger explanation behind it, but the simplicity of the equation seems improbable.
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5Obligatory reminder that the full form of the equation is $E = \sqrt{p^2c^2+m_0^2c^4}$. – Kyle Oman Aug 07 '14 at 18:33