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Mathematical astronomy

The discovery in 1846 of the planet Neptune was a dramatic and spectacular achievement of mathematical astronomy. The very existence of this new member of the solar system, and its exact location, were demonstrated with pencil and paper; there was left to observers only the routine task of pointing their telescopes at the spot the mathematicians had marked.

James R. Newman, The World of Mathematics, New York: Simon and Schuster, 1956.

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The best computer programs

"... The best computer programs are the ones in which the computer itself "disappears," in which you work directly on the problem without having to be aware of the computer." Donald Norman. in The Psychology of Everyday Things. -Basic Books, 1988, p. 180.