Dear, you mention scientist Stephen Hawking and ask him a question about clock time. Then you talk about medical science and aeronautics, which made it possible to visit the surface of the earth. Every discovery, big or small, has contributed to the human world. In particular, I agree with you, medical science has taught us who discovered the vaccine from the corona epidemic. If there was no science, people would have to fight with the environment like the primitive age. Your writing about science is very beautiful. Good luck to you.