Everybody hates that feeling when you spend three weeks reading a book, and a month later somebody asks you about it and you can’t remember a damn thing you read. Not only does it make you feel stupid, but it also makes you wonder why the hell you wasted a couple dozen hours of your life on a bunch of words that didn’t stick. There are better and worse ways to learn. And interestingly, despite all of the babbling that goes on in school when you’re a kid about what you need to learn, not...