> You have to keep a dozen of your favourite problems constantly present in your mind, although by and large they will lay in a dormant state. Every time you he

> You have to keep a dozen of your favourite problems constantly present in your mind, although by and large they will lay in a dormant state. Every time you hear or read a new trick or result, test it against each of your twelve problems to see whether it helps. Reminds me of similar patterns elsewhere. People keep "tabs" open on specific topics and add information over time. - Mathematician Serge Lang kept correspondence and related documentation in extensive "files" - Tony Fadell says you should keep coming back to ideas that you can't stop thinking about and add more insights over time