Topology is the study of the properties of a figure that are unchanged by any deformation.

Civilization as it is known today could not have evolved, nor can it survive, without an adequate food supply.

唯一真正的自由是做自己的自由。

实现明天的唯一限制是我们今天的疑虑。

The most controversial thing I have ever done is to stick around.

最好的研究是由好奇心和必要性共同驱动的。