Have any of you heard of the hydrosonic pump? It is an "over unity" device that actually works. It is said to produce about 1/3 more energy in heat than it requires in electricity to produce. It is not a perpetual motion machine because it does not produce enough energy to run itself (converting steam to electrical power is very inefficient). But still, it produces more heat energy than is input in the form of electricity. The inventor, a man named James L. Griggs, believes it to be the result of induced cavitation (a situation that a designer usually tries to avoid, where flash steam is created by changes in pressure in a pump.) The invention had some problems with bearings and NASA provided some solutions in exchange for some technology rights to the device. http://www.sti.nasa.gov/tto/spinoff2000/ip3.htm The device is in commercial use. Here is a web site for the company. http://www.hydrodynamics.com/index.htm [Broken] Here are some discussions on the greater than 100% efficiency claims. http://homepages.ihug.co.nz/~wayfarer/anomaly/technology/runswater_trans.htm [Broken] What do you think?