种一棵树最好的时间是20年前，其次是现在。
"The difference between correlation and causation is fundamental in empirical work."
The world is so unpredictable. Things happen suddenly, unexpectedly. We want to feel we are in control of our own existence. In some ways we are, in some ways we're not. We are ruled by the forces of chance and coincidence.
"I don't act to escape reality. I act to understand it better."