Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

世界上没有什么比笑声和好心情更具感染力了。

心理学理论必须通过实践经验的检验。

争论不应该是煤炭与可再生能源的对立，而应是如何让两者都变得更好。