Honestly, I wish I could side with books for this for non-fiction (I'm old school), but often I find that much of it is filler. E.g. Wim Hof's book - as much as I love the WHM, it really could have been done in a chapter or two. The rest was just rehashing the same concepts again and again. That said, I have a real soft spot for College text-books. The newer ones are often beautifully written.