"Satisfaction, for us, is only a brief thing. The man who acquires wealth does not reach a point where he has enough. Success for us is more like acceleration than speed. Interest cannot be maintained at a constant level."

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It is astonishing to realize that until Galileo performed his experiments on the acceleration of gravity in the early seventeenth century, nobody questioned Aristotle's falling balls. Nobody said, Show Me!

— Neil deGrasse Tyson