Fantastic!! High-quality educational videos like this are hard to come by. Here's another retro tutorial that really stands out in my memory (differential gears

Fantastic!! High-quality educational videos like this are hard to come by. Here's another retro tutorial that really stands out in my memory (differential gears): http://youtu.be/K4JhruinbWc?t=1m40s http://youtu.be/K4JhruinbWc?t=1m40s