One of the things I want to do with my life is to greatly progress humanity. It seems only obvious to study those that accomplished it. Thus, (whenever priorities allow) I choose one great person and study everything that was written by or about them for about a month.

The goal with such "research bouts" is to change my day-to-day actions based on learnings; learning is changing actions, not memorizing facts. Moreover, I hope to have a strong mental model of a person, so I could somewhat confidently say what would they do in different situations.