Some cool physics experiment

[joey]

[ame="http://www.metacafe.com/watch/55826/who_can_explain_this/"]Who Can Explain This Video[/ame]

 

[SpitFireV12RR]

Okay...where's the string and the computer that took the string out?

 

[SumoDethRat]

http://www.howstuffworks.com/question610.htm

Its cool to watch I remember this in my a physics book a long time ago.
Whats also cool is using a metal plate that you can change to vibrate at different frequencies and pouring sand on it. After a few seconds it almost looks alien.

 

[robriguez]

No string, there are materials that become conductive when their critical temps are reached. In this case the black material is being supercooled most likely by liquid nitrogen. As it cools it creates a magnetic field that both attracts and repels the ferrous disc. Since the material is light weight, when the disk is raised the material is raised as well. Then if you look closely you can see the material warming up. As it warms up it looses its conductive nature so it no longer has the strength to repel the disk.

Sorry, I no longer have enough brain cells to get more technical than this.

Edit: Bah...just read Sumo's Link... can't get no shine..