I offer a machine that only works with gravity.
You just have to imagine a machine that works without fossil fuel or requires an enormous amount of water. This machine is for everyone, from simple particulary to mass production. We use gravity, we do not operate to its full potential. Can you tell me why no one has thought of using gravity to build a standalone machine until now. All this means that I am capable of producing high energy at very low cost. email@example.com