How rereading and teaching turn books into usable knowledge

How can someone read hundreds of books and retain the information?

He reads quickly at first, rereads the material several times, teaches it to consolidate the ideas, and returns to the book whenever he needs exact details.

A fast first reading gives only a rough impression, while second and third readings progressively fix the argument and evidence. Teaching the material is the final consolidation step, after which the relevant book and approximate section often remain accessible in long-term memory. Exact details still require returning to the source rather than treating memory as a substitute for checking. The method is personal rather than universal because it is linked here to dyslexia and weak short-term memory. It distinguishes remembering where evidence lives from memorizing every detail.