Not only is flipping back and forth much easier in a math/technical book, but, for some reason, I find I actually learn better. Something about associating a p

Not only is flipping back and forth much easier in a math/technical book, but, for some reason, I find I actually learn better. Something about associating a piece of information with a physical location on a real object makes everything "snap" together better in my head ("Oh, I remember this concept, it was about a third of the way through Dummit & Foote. Yep, it's all coming back now."). I can still pick up my calculus textbook from a class I took 5 years ago and open more or less in the right section of what I'm looking for. I've associated that object, it's weight, feel, and size, with the information it contains. I can't say the same about any of the dozens of pdf's I have on my tablet. I'd probably have trouble opening the right file, let alone where inside that file the information is! If it matters or is long-term knowledge, I always get the book. (Even if given the insane pricing of textbooks, I wish this didn't have to be the case...)