From the beginning, an inventor is warned that he is facing "one of the eternal." The problem was not even described, and nothing specifically said; however, the inventor is already intimidated in every respect. Not everyone can show the bravery needed to conquer an "eternal problem" - an undefeated problem, even in the time when "secrets of the atomic nucleus are discovered, and the sensitive ears of radio telescopes listen to the whispers of the farthest galaxies!"...

The more eternal the problem, usually the easier it is to solve. As a matter of fact, when the problem appears, the conditions to solve it already exist. Each unsuccessful attempt to solve it reduces the degree of uncertainty along with the search field...

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