You don't listen to Feynman because you want the most efficient way to prepare for your Physics exam, or because you want to hear about the latest developments.

You don't listen to Feynman because you want the most efficient way to prepare for your Physics exam, or because you want to hear about the latest developments. You listen to him because he was one of the greatest minds of the century, as well as a very entertaining and charismatic speaker. It's not hard to see why that combination of qualities attracts a lot of people.