How are we operationalising "best" here? The purpose of textbooks is to efficiently impart material. Popular books have a wide variety of purposes (to inform, inspire, entertain, polemicise, etc.), so by what standard are we holding one popular book to be superior to another?
I enjoy reading popular-level books on a wide variety of subjects, and I love getting new book recommendations. In the spirit of lukeprog's The Best Textbooks on Every Subject, can we put together a list of the best popular books on every subject?
Here's what I mean by popular-level books: