Steam-driven technology was discovered long ago, but no one found its use value. When people found its value, this technology was greatly promoted. It can be regarded as a revolution. The appearance of electricity is not accidental. If people stop at an ignorant feudal society, then the west at that time was also a feudal society. People can't see the actual function of electricity, such as driving force, such as telephone and TV signal transmission, so they will think it is useless. We won't pay attention to it until the level of science and technology and society have changed. After the revolution, when people suddenly needed more powerful abiotic energy, people discovered electricity. These processes are developed according to social development. If you say that there is no invention, there is no discovery, that is impossible, they will be discovered and invented. Just as war is inevitable for human beings, the emergence of nuclear technology catalyzed by war means that human beings have entered the nuclear age. That depends on the development of human society!