I have built the rainmaker device, and another of my own design using Dave's principles. I am privleged to correspond with Dave privately, and consider him to be a mentor. While I may not agree with everything he says, I have proven to my own satisfaction that his gravity fractal is real and can be a potential source of energy. You will not learn anything useful if you do not follow his simple instructions and start building his devices. His plans and list of materials are readily available to the home experimenter. Dave is the real deal and a genuine human being. As for myself, I am a retired geologist and student of esoteric knowledge. Dave's website resonantfractals dot org is an excellent source of references on torsion physics that can not be found elsewhere.