[everdrive]

I think different topics lend themselves to this better than others. If you're merely teaching about things, then there are endless interesting topics -- and _you're_ not the one coming up with the brilliant insights; you're just doing an excellent job conveying an already-known subject to others. Commenting on the news can work quite well, too. So long as your research and analysis maintains quality, there will be no shortage of noteworthy events to discuss.