科学是微分方程式，而宗教是边界条件。

Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.

"Sometimes, the only way to stay alive is to keep moving."

回忆是我们唯一不会被驱逐的天堂。