"If I were not a Physicist, I would probably be a Musician. I often think in music. I live my daydreams in music. I see my life in terms of music. I get most of my joy in life out of music." Albert Einstein :)
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Albert Einstein's General Theory of Relativity, 1916. This is one of the most elegant equations in existence today. The fact that Einstein's theory has not (yet) been proven no longer viable makes it even more spectacular.