VAT19.com - molding sand, magnetic putty, liquid glass putty, rubber band guns. some very cool stuff
Liquid Glass Thinking Putty (http://www.youtube.com/watch?v=kOGJaBP0ihg#ws) The Human Slingshot (http://www.youtube.com/watch?v=AMM5YRp0Ztk#ws)
Euler's Disc Spins for Minutes (http://www.youtube.com/watch?v=sBM-YMLjMn4#ws) Synthetic Indoor Snowballs (http://www.youtube.com/watch?v=4wiJsk1o7n0#ws)
Super Illusions Putty with Color-Changing Properties (http://www.youtube.com/watch?v=OntuP7ZUmCE#ws)