This came from my ideation as a reaction to the current overreliance from fossil fuels.

See picture at http://midas.blogsome.com/images/gravitymill.jpg

A GravityMill using bubble rims with magnet. The vertical section on the left is immersed in a heavy liquid. The right side is sealed and the liquid is prevented from seeping. The bubbles entering the liquid is pushed up by the volume displacement of the liquid. On the other half, the gravity of the bubbles out of the liquid provides a force downward to reinforce the circular movement. The magnets in the bubble containment can then be used to excite electrons flowing thru a coil in a unidirectional way to produce a positive and a negative terminal. Gravity is then harness for lighting etc.