Since you linked that nice biology article I'm guessing you already know about "The Machinery of Life," that book seems like it would be good. The Kurzgesagt Immune System book is probably even better as it's intentionally written at an accessible level.

Organic Chemistry as a Second Language is maybe my favorite introductory text of all time though it might be a little dry if you aren't already interested.

It has its own political bend but I would recommend "A People's History of the United States." There's a lot of quality graphic novels out there that are interesting in a different way than textbooks that can teach a lot of history. I'm thinking of Persepolis as an example.