The human mind is always interested in those things that it can not understand; as soon, however, as the problem has been solved it is no longer an absorbing subject of attention. When a sleight-of-hand feat has been explained we turn with renewed zest to something else and revive our former interest only to mystify or amuse some friend. The unsolved problem, on the other hand, will grip our undivided interest for an indefinite length of time; our minds will revert continually to the unelucidated trick of legerdemain until we learn how it was accomplished. And so we might continue our illustrations thru the whole range of human knowledge.

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