Deep in the human nature, there is an almost irresistible tendency to concentrate physical and mental energy on attempts at solving problems that seem to be unsolvable. Indeed, for some kinds of active people, only the seemingly unsolvable problems can arouse their interest.

Ragnar Frisch

Active Almost Arouse Concentrate Deep Energy Human Human Nature Indeed Interest Irresistible Kinds Mental Nature Only People Physical Problems Seem Seemingly Solving Some Tendency

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