somehow I doubt that the person I was replying to would consider ebooks as a book.

videos can be viewed in double speed, and they can be rewound. they can be watched over and over if needed. they can describe/demonstrate information in ways that books can only project into 2 dimensions. a picture is worth a thousand words - well imagine 24 of those per second.

certainly with STEM subjects, nothing beats a good animation.

even for things like history/geography, I find animations and progressive disclosure to be much more engaging and easier to remember than dry words on a page.