High school physics teacher shows his awesome home made marble tracks - BoingBoing | iPads, MakerEd and More  in Education | Scoop.it
Teacher Bruce Yeany built a number of physics demonstration props that use balls, tracks, and gravity, and it's a delight to see them in action. He also has videos to show you how to make your own. Very cool! I just subscribe to his YouTube channel, filled with home made science toys.