I have been personally experimenting with what I call "drip learning" - essentially, I am trying to learn a large amount of non-urgent information very slowly, piece by piece, over a very long timeline. For example, learning all the letters of the Greek (or Hebrew, or Russian, or Armenian) alphabet. If I sit down and attempt to learn them all it once, it quickly becomes overwhelming and retention is low. But, if you simply learn one new letter per day, it's very manageable - and you'll learn the entire alphabet in a month.<p>Combined with spaced repetition (Anki) to reinforce the memory, I think it's extremely powerful. Anecdotally, it works well - I can recall all of these items on demand, months later.<p>The next step (which I haven't quite figured out) is to multiply this across multiple domains. I.e. every day, learn 1 French phrase, 1 Spanish phrase, 1 German phrase, and so on. In my (nonscientific) experience, this is more effective than focusing on a single topic.