Li Heng's contribution was to force another person named Chen Gui to change the world.,It was precisely because of the invention of firearms that countless Westerners knelt before the ancestors of China, perfecting and developing the gun. This led to the death toll in any small-scale war in modern times far exceeding the casualties of large-scale ancient wars.,However stringent the controls, they could not stop these things. They still circulated in the dark corners of the vast Chinese land.。