Dispatches from the Dirt Lab: Dry Quicksand from Matt Kuchta on Vimeo.
Wherein I explain the mechanics of dry quicksand.
This video also contains an idea that I've had before - soliciting interesting questions from the audience. I've got material that I'm shooting to use in my classes, but if there's another topic that people who aren't in my class might find interesting I'd like to hear about it. Especially since I interact with many other geologists on the web, I know what they find interesting - but I don't want to just reach out to that group. Most people aren't geologists, so I would like to think that there are other questions our there that haven't occurred to me yet.