You are joking, but it is true. I'm old and grew up on books - bookstores were my paradise, but I still feel the book format is kind of outdated. I much prefer smaller sized and self-contained pieces of information. When it comes to e-books, I think the ones that are less like traditional books and more embrace the possibilities of the medium are best. Klabnik/Nichols "The Rust Programming Language" is a great example, even more so Google's "Comprehensive Rust".