The lightning-bug and the lightning

E =MC*2
E = mc2. It’s the world’s most famous equation, but what does it really mean? “Energy equals mass times the speed of light squared.” On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.

The difference between the almost right word and the right word is really a large matter—’tis the difference between the lightning-bug and the lightning.–Mark Twain, in a letter to George Bainton (1888)

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