"The high number from the Middle East is only coincidence, he said. It is no particular choice on our part, ... We accept visa trainees from those countries. We'd accept them from other countries, too, but we don't get their applications."
"In many cases a dull proof can be supplemented by a geometric analogue so simple and beautiful that the truth of a theorem is almost seen at a glance."
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Source: Mathematical Games. Scientific American (October 1973), later quoted in Roger B. Nelson Proofs Without Words: Exercises in Visual Thinking (Introduction, p. 5), 1993.
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