Productive thinking is characterized by the sudden appearance of the solution as an insight.
世界的情况在不断变化，人的观念也在变化。 政府是为了生者，而不是为死者，只有生者拥有任何权利。
Auction design is as much about psychology as it is about mathematics.
The best way to learn mathematics is to do mathematics.
过去总是紧张的，未来是完美的。