I don't know if you have seen Liu's Back in Time. In part, scientists changed the human genome sequence, added many auxiliary organisms' gene configuration, and human beings began to eat grass and mastered the ability of flying. The first contradiction that follows is: religious issues. Do you think people who can fly are still people? In fact, flying is not the most powerful and achievable skill of human beings. Try to imagine why memory can't be inherited. What would your feet look like if your family began to pass on memories from the initial stage? Ps: This view is not mine. I also recommend you to read Liu's 20 18. I don't care, but I like it very much. Give priority to popular science, supplemented by entertainment. It is always good to know more.

From the perspective of genetic evolution, many things are random. What we are seeing now is one of countless possibilities. You can't find the option of "growing wings", even the computer at the end of the world, because what you want to change and look for is the law of the universe, the calculation above the quantum level, and even carbon-based life is not worth thinking about. Of course, we can cultivate people with wings, but this is not natural selection. Evolution has advantages and disadvantages, but who decides? Nobody made it clear. Try not to go against nature and create things that never existed or just species. You can change more than just an existence. Don't ignore the power of consciousness. One day, consciousness will decide everything.

Theoretically speaking, even if human beings can fly without external force without changing any human body structure except transplanting wings, as far as the purpose of flying is concerned, this idea is stupid compared with relying on external force. After all, the greatest advantage of human beings is to make and use tools. But this does not prevent discussion on how to achieve such a flight.