Why do you say that? I can calculate the orbit of celestial bodies, but I can't calculate the greed of human nature. "

This is what Newton said. Newton later made a lot of money in stock trading, and then borrowed money from many relatives and friends to stock trading, resulting in bankruptcy. Then he said with emotion, I can calculate the orbit of celestial bodies, but I can't calculate the greed of human nature.

Philosophically speaking, it embodies the natural and social laws of society. Natural laws can be copied, but social laws cannot be copied. Therefore, it is much more difficult to study social laws than natural laws.