Sustainability isn't an option anymore - it's our responsibility to future generations.

Psychology must be purely experimental and analytical.

The greatest virtue of man is perhaps curiosity.

数学是为数学家而写的。

我为我们没有做的许多事情感到骄傲，就像为我们做过的事情感到骄傲一样。创新就是对一千件事情说不。