The development of science and technology is a double-edged sword for human beings. The progress of science and technology has reduced the labor force and liberated human hands. This shows that there will be a lot of mental work in the future. If so, human evolution may be mainly in the head. It's like aliens in movies or various reports are all big heads and small bodies. Are these some problems brought by science and technology to mankind? This is like saying that aliens can roam the universe proudly, proving that they are technologically advanced. They may completely free their hands and their bodies will slowly degenerate. In the end, humans may also have big heads. This is not in line with people's aesthetic standards. It may also polarize human beings. Some people who love fitness will have developed limbs and some will have big heads. I want to laugh when I think about it. But I can't see it anyway. I shouldn't.