in 1999, legendary theoretical physicist hans bethe, who discovered the violent force behind sunlight, helped devise the atom bomb, and eventually cried out against the military excesses of the cold war delivered three lectures on quantum theory. the presentations made only limited use of mathematics focusing more on his own personal as well as historical perspectives. bethe was 93 at the time and died this past march. you can check the lectures out on the web thanks to a cornell site (where he worked and taught for 70 years) called quantum physics made relatively simple. each lecture averages about 45 minutes and are synchronized with slides of his talking points and archival material. the curious should bookmark and watch at their leisure. don’t let the thumbnail worry you, there are no chalkboards involved.