I’ve occasionally bought lecture courses from “The Great Courses.” For example, I bought a 36 lecture series on the history of Russia.
I don’t buy them very often because they’re expensive and there are so many great podcasts out there for free. (NEVER buy one of these lectures when they’re not on sale. But even on sale, you’ll spend real money. The 96-lecture series on astronomy is on sale for $114.) But the production quality was excellent and the subjects interesting.
Every once in a while, they’ll put up a free lecture from one of the courses, in order to entice me to buy the whole thing. The last one I saw was on voting.
My first thought was, “how are you going to talk about voting for 30 minutes?” I mean, how much is there to say?
I was wrong. 25 minutes of the 30 minute lecture are really interesting. The video is a little hokey, but the content is worth your time.