You don't need a weatherman to know which way the wind blows.
If you can’t tell what you desperately need, it’s probably sleep.
In auctions, the rules determine the outcome as much as the bidders' strategies.
最好的实验往往源于简单的想法和细致的观察。
Half the world is composed of people who have something to say and can't, and the other half who have nothing to say and keep on saying it.