因果模型是理解世界的关键。
The causal model is the key to making sense of the world.
The best designs come from understanding the needs of the people who will use them.
只要能够改变你自己的头脑，你就可以永远保持年轻。
You take delight not in a city’s seven or seventy wonders, but in the answer it gives to a question of yours.
当人微笑时，世界爱了他。当他大笑时，世界便怕他了。
数学的进步归功于那些不是被应用的欲望驱动，而是被发现的喜悦驱动的人。