It's fun, humbling and inspiring to see good explanation media in unexpected places. The Federal Trade Commission has quite a few media resources at http://www.consumer.ftc.gov/media. This one was particularly fun.

The combination of hand-drawn visuals with multi-plane animation, object movement and camera movement - that's not easy, kids. Notice the reflections on the hood when the car is moving, and the birds flying alongside about 12 seconds in. And the camera zooming in, as the car zooms up to the stop sign at @25 seconds. As I said, deft. Whoever did this - nice, thanks!

-md