生活的目的不是快乐。它是有用、可敬、富有同情心，让你活得有意义且活得好。
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
The most powerful tool in science is not technology, but imagination.
我从不追求完美，因为完美是不存在的。