We don’t do market research. We just make things we believe in.
In mathematics, you don't understand things. You just get used to them.
Making something variable is easy. Controlling duration of constancy is the trick.
种一棵树最好的时间是20年前，其次是现在。
两种文化之间的距离是最有趣的事情发生的地方。
The greatest intellectual adventures often begin with a simple "What if?"