One time when I go out shopping, meet my landlord, and he called out, ask him why, he is listening to others speak now with solar energy, monitor the eastern front, he wants to try to look at the exactly have worked so well, people say so magical, it bought a back later, but it will not install, then my friend is doing this, just to let my friend help me install it solar energy monitor, installed, it just can’t help tried, said this thing was amazing, but also more convenient to use, in particular that, for the development of science is also more and more faster, what are some inventions.