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Dreams taught me never to doubt myself, by letting me do the impossible.
"The doubters said, "Man can not fly," The doers said, "Maybe, but we'll try," And finally soared In the morning glow While non-believers Watched from below."
Everything is theoretically impossible, until it is done. One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen.