The ideas I have so far are
fairness [using, in part, "Harrison Bergeron" (a short story)]
bass lines (in music—instrumental, vocal—bass guitar discussion?)
Marty suggested we could use thinking sticks sometimes—throw two topics and run connections. I think we might try to connect everything to whatever item, movie, story, or concept that's used. I couldn't get the blog names that would make the simplest sense, so I went with "thinking sticks." There will be links to this on my unschooling page and my blog, in case you can't remember where it is.
Respond to this post with suggestions for topics.