"Sometimes, you have to be a little bit naughty to get what you want."

Parental investment is the key to understanding sex differences in mating strategies.

The secondary rules are those that provide for the creation, alteration, and extinction of primary rules.

最好的投资是投资于那些正在建设未来的人。

那些愿意为了安全而放弃自由的人，既得不到安全，也得不到自由。