The world is a place of the living, and the dead have no place in it. The dead are nothing. They are not even a memory. They are forgotten. And the living, too, will be forgotten.

条件作用原理同样适用于所有物种。

This is my Jenny.

"The scientist is not a person who gives the right answers, he's one who asks the right questions."

文学是人类的记忆。

数学是逻辑思想的诗歌。