How to Remember a Non-Fiction Book (A History Example)
August 4, 20264 min read
A method for reading a serious non-fiction book and still knowing it months later: take notes as you read, turn them into flashcards, and let daily reviews bring them back.
Skip to the guideOne thing first: the book needs a text layer. EPUB and most PDFs are fine. A scanned PDF with no text layer will open, but you cannot tap or look up words in it, because pimReader has no OCR.
Now the scenario. You read a 500-page history of the Ottoman Empire. It was excellent. Six months later someone asks you about it at dinner and you produce... "it was really interesting, there was a lot about trade."
That is a problem of method, not intelligence. Reading puts things in; memory needs you to get them back out. Without that step, what you understood fades.
The method below adds a few minutes to each reading session.
Before you start: one folder, a few tags
Open Notes and make a folder for the book. Nothing more elaborate.
Tags come later, and they should be thematic rather than structural. For a history book: causes, people, numbers, disagreements. You want to be able to pull "every population figure I noted across six books", not "chapter 4".
Don't tag by chapter; you will not search by chapter.
While reading: capture three kinds of things
Read normally, without stopping all the time. When you meet one of these three, capture it.
A fact you'd want to recall cold. A date, a figure, a name and what they did. Select it, save it as a note, tag it.
A claim you might want to argue with. Save it and add a comment in your own words, such as "this contradicts what the other book said about the timeline". Your own words help it stick.
A word or concept you didn't know, such as devshirme, timar or millet. Treat them like foreign vocabulary: save them as notes and turn them into flashcards.
Speed matters more than completeness. Twelve good notes beat sixty highlights you never look at again.
After a chapter: interrogate it
Open Ask AI while the book is open; the AI Mentor can see what you are reading. Ask the things you'd ask a study partner:
"Summarise this chapter in five bullet points."
"What's the causal argument here? What does the author claim caused what?"
"Which claims in this chapter would a historian dispute?"
The last question is the most useful. Non-fiction often reads as settled; asking what is disputed brings the argument back, and arguments are easier to remember than statements.
You can also ask across your whole library:
"Where else have I read about Janissary recruitment?"
Search by meaning finds passages that match the idea, not just the exact words, including in other books and articles in your library.
The key move: notes become flashcards
This is the step that makes the difference.
Take a note and ask the AI Mentor to turn it into flashcards. It writes the questions; you keep or discard each one.
Good flashcards from a history book look like:
- "What was the devshirme system?"
- "Roughly when did the Ottomans take Constantinople, and why did the walls fail?"
- "What is the author's explanation for the 17th-century fiscal crisis?"
Bad ones look like "What happened in chapter 6?": discard those. A flashcard should have one answer that you either know or don't.
You can also give it a whole passage or a table of dates, get a proposed set back, and keep the four that matter.
Then let the daily reviews carry it
Now the cards join your daily reviews (the Exercise card on Home), scheduled by spaced repetition, which brings each card back when you're likely to start forgetting it.
Rate each one Again, Hard, Good or Easy; each button shows the interval it will set. Cards you know move out to months. Cards you keep missing come back tomorrow.
A few dozen cards from a book take a couple of minutes a day, far less than re-reading the book, which you probably won't do anyway.
A month later: check yourself
Ask the AI Mentor to quiz you.
"Quiz me on my notes from the Ottoman book — ten questions, mix of dates and arguments."
Getting answers wrong is uncomfortable, and it shows you the cards you thought you knew.
If a whole area turns out to be weak, ask for a short course on it. The AI Mentor can build a few focused lessons from your notes and the book.
What this looks like in practice
The numbers depend on the book and on you. As a rough guide for a 400-page book read over six weeks: a few dozen notes, a few dozen flashcards kept, some extra minutes per session, and a small daily review afterwards.
The aim is that next time someone asks about the book at dinner, you have more to say than "it was interesting".
Why doing it in one app matters
You could do all of this with paper and a separate flashcard app. The reason to do it in pimReader is that the book, the notes, the flashcards and the schedule are in one place.
A passage you select is a couple of taps from being a flashcard, and the flashcard is one tap from the page it came from. Nothing gets retyped or lost between apps.
Pick a book you are already reading and try it on one chapter.
Notes, tags, folders, flashcards you write yourself and daily reviews are free; chapter questions, search by meaning, AI-made flashcards, quizzes and courses use AI, which is part of pimReader Plus, free for the first month.