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A long habit of not thinking a thing wrong

"A long habit of not thinking a thing wrong gives it a superficial appearance of being right, and raises at first a formidable outcry in defense of costum." 

Thomas Paine, Common Sense, 1776

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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.