Astronomer, why does my brother think my brother is stupid?

Because my brother always uses his pure fantasy to feel and understand him every time he encounters something, which is more emotional and always feels that everything is very simple. The elder brother is more rational, so he contrasts with the younger brother.

Perception and rationality are conflicting to some extent. As we grow older and learn more and more knowledge, we are bound to look at and solve problems more rationally.