"For the rest of his life, Oliver Twist remembers a single word of blessing spoken to him by another child because this word stood out so strikingly from the consistent discouragement around him."

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It is surprising that people do not believe that there is imagination in science. It is a very interesting kind of imagination, unlike that of the artist. The great difficulty is in trying to imagine something that you have never seen, that is consistent in every detail with what has already been seen, and that is different from what has been thought of; furthermore, it must be definite and not a vague proposition. That is indeed difficult.

— Richard P. Feynman