As long as I'm posting Soviet animation, I figured that I might include this "Atoms for Peace" example I found. Titled Здравствуй, Атом! (Hello, Atom!), this short film describes the basis of nuclear technology through the investigations of three letters- Ф (physics), М (mathematics), И (engineering), and "вопрос" (the question mark).
"Атом- почты волшебник."
The atom- it's almost a sorcerer.