Certainly the best article on HN in the last 48 hours. Very cool stuff. In my part of the U.S., some public schools are talking about shortening the school we

Certainly the best article on HN in the last 48 hours. Very cool stuff. In my part of the U.S., some public schools are talking about shortening the school week 4 days because of funding problems. I've been thinking about what kind of things I can do on a Friday to step in to teach if that happens. This is just the kind of thing that could work.