Genius, comparable in its magnitude to Da Vinci, - so often they speak about Andrei Nikolayevich Kolmogorov. On the occasion of the 120th anniversary of his birth, we decided to understand where genius comes from. We searched for the secrets of genius in his lineage and upbringing, in his favorite home and people, directly in his works. We talked to his students. But we never managed to unravel the mystery of genius. Perhaps you will succeed? We share with you everything we found*.