The SU had a program of requiring world-class mathematicians (Kolmogorov, Arnold, Gelfand), physicists, etc. to teach one year in high school, and to think about the curriculum, and possibly write textbooks. Some of these were available in English via MIR publishers. Some of these books are unique moments in the history of mankind. The science education in SU trickled down throughout eastern europe. Indirectly this school of thought has been responsible for some of the best science and engineering in the world, sadly, mostly outside of the place that originated it.