Yesterday afternoon, in order to increase my knowledge, I mistakenly joined a doctoral group. I saw a man ask: A drop of water falls freely from a very high place.

If they really have a high degree, of course they know the answer. Perhaps in the eyes of doctors, the meaning of this sentence is not superficial, but something deeper. They are probably discussing why they were killed or why they were not killed.

After all, doctors like to prove it with facts. In their eyes, facts are numbers, which is an objective rather than subjective concept. After all, a doctor's high degree is not recognized by his life experience. You seem to have exposed yourself by saying that. Since it is a doctoral group, the whole group is serious about the problem.