—— 请按键盘 空白键 开始游戏 ——

Natural experiments can provide valuable insights into economic questions.
"The best ideas come when you're not trying too hard."
The most thought-provoking thing in our thought-provoking time is that we are still not thinking.
The heart of another is a dark forest, always, no matter how close it has been to one's own.
The key to understanding life is to understand the interactions between its components.