Free energy devices would be the ultimate game changer, this is totally off topic but something of interest to me as a hobbyist engineer. Two major inputs to anything that is produced is Time and Energy. If Energy could become totally abundant and outside of anyone's or things control society would flourish. I believe that energy is being artificially restricted now through the various alphabet organizations of "Government" (EPA) to prevent the lose of control of the people and the steering of society(s) as a whole. This however would change the power structure of the world because the energy industry would be radically changed and the nations that depend on energy exports would find themselves in the poor house potentially overnight depending on the ease the Free energy device's construction and use. It would also allow for food to be grown in gigantic quantities using power intensive processes such as aqua/hydoponics further eliminating controls. All industrial processes would instantly become cheaper overnight and the living standards of most of the developed would would increase almost instantly with the undeveloped soon to follow. You can see how the "money masters" would fight this from happening to the death. Its unfortunate.