Maybe watch this with him, it's George Dyson (Freeman's son) recounting the story of the development of the computer at the IAS. It links CS to that fulcrum of the 20th century, the invention of the nuclear bomb. It's also highly entertaining, a very story told through coffee and ink stained punch cards.

https://www.youtube.com/watch?v=Tg5gJxXBh8s

Thinking about it perhaps your son is more into knights, emperors and prophecies than cold war paranoia. It's a great video anyway.