"One good technique to use instead is to read once, then quiz yourself, either using questions at the back of a textbook chapter, or making up your own questions. Retrieving that information is what actually produces more robust learning and memory.

"And even when you can't retrieve it - when you get the questions wrong - it gives you an accurate diagnostic on what you don't know, and this tells you what you should go back and study. This helps guide your studying more effectively.

"Asking questions also helps you understand more deeply. Say you're learning about world history, and how ancient Rome and Greece were trading partners. Stop and ask yourself why they became trading partners. Why did they become shipbuilders, and learn to navigate the seas? It doesn't always have to be why - you can ask how, or what.