Tell me about the last class.

The most impressive lesson is that the class teacher told a story to the whole class in junior high school. At that time, I was talking about Bill Gates, the richest man in the world, but I was still a junior high school student and had no idea about the richest man in the world. Maybe he wants to motivate us. When he said this, he probably meant that Bill Gates earned 400 million a second. If10 million falls to the ground, he won't bend down to pick it up, because it takes a few seconds to bend down, and he will earn a few 400 million less.

I was particularly impressed by this incident. What I feel now is that I was really naive when I was a child.