I recently saw a video on you tube about perpetual motion machine. Here is the link:

http://m.youtube.com/watch?v=OS1KXMsE2qk&ctp=CDwQpDAYFCITCIfE5t7J0b4CFaopfgodNXsAy1IXcGVycGV0dWwgbW90aW9uIG1hY2hpbmU%3D&guid=&hl=en-GB&gl=IN&client=mv-google

Its on Robert Boyle's flask.
From where does the energy come ?