Nitinol heat engine! free energy CNN 1982!

In 1982 CNN had on a motor that could run on the diffrence between a hot and cold part of the machine.  Similar to a Stirling engine but with way more torque and strength.  This is the Nitinol Heat Engine.  Lots of videos on utube!  It can be made any size and run on sunlight! also called a thermobile!  NO REASON AT ALL why it is not used for solar power plants!
http://www.youtube.com/watch?v=fD637L3W-Jw

http://en.wikipedia.org/wiki/Nickel_titanium