"You imagine that I look back on my life's work with calm satisfaction. But from nearby it looks quite different. There is not a single concept of which I am convinced that it will stand firm, and I feel uncertain whether I am in general on the right track."

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Source: Albert Einstein, Leopold Infeld (1966). “Evolution of Physics”, p.15, Simon and Schuster

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Albert Einstein

Physicist

Albert Einstein was a theoretical physicist known for developing the theory of relativity, which transformed our understanding of space, time, and energy.

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