My paper is a video presentation, but before I show it, allow me just a few words. My contribution is not a scientific paper. In this video we shall be faced with the facts. Facts are always that starting point in the process of thinking, and thought is the basis of human activity. These facts are given concisely in 25 minutes, which is — frankly — nothing compared to the hours and hours I spent watching the raw documentary material, selecting it, and making the final version of the video that you are about to see.