In 1993 D.Christodoulou and S.Klainerman proved Global Nonlinear Stability of the Minkowski Space. It was one of the most important results of the mathematical General Relativity. Their proof was published in an over 500-pages book. It stated, that any initial data "sufficiently close" to that corresponding to the Minkowski space will remain so forever. Most of mathematical physicists belived this frankly simple fact but the proof was one of the most sophisticated in the field.