Before the Internet, there was The Fontana Dictionary of Modern Thought
everything.intellectronica.net
everything.intellectronica.net
Kids these days rarely have patience for this sort of thing, at least my kid doesn't. There is just too much overstimulating information everywhere - how can an Encyclopedia compete with TikTok and Youtube algorithms that leave the child laughing nonstop?
It's not just your kid, I know some long-time K-12 teachers and they would agree with you, to say the least. This is something they've been complaining about since before covid.
It's roughly what you'd get if you asked a class of seniors a week before their graduation to write a few paragraphs on every topic they covered in college. Not a serious source, but enough to whet deeper interest or start a conversation.
"Very Short Introductions" [2] were also great to trade with friends.
[1] https://www.amazon.com/Incomplete-Education-Judy-Jones/dp/03...
https://en.wikipedia.org/wiki/Brewer%27s_Dictionary_of_Phras...
Also, we had The Whole Earth Catalog.
These are a couple more unique casualties of teh Internets tubes.
I appreciate any reading material that helps with understanding how the world works. Please share if you have other recommendations.