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(just those submitted by Caldwell)
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+ F. Viete (1540-1603) expressed pi as an infinite product containing only 2 (and its reciprocal 1/2). [Caldwell]

+ It is possible to measure all of the integer distances from one to six on a six-inch ruler with just 2 marks. For example, the distance from the 2 to the right end is four inches. [Caldwell]

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