People who treat other people as less than human must not be surprised when the bread they have cast on the waters comes floating back to them, poisoned.
Collaboration is the key to solving the big challenges in food production today.
数学中真正的挑战不是解决问题，而是提出正确的问题。
在那样的年纪，我会找任何借口做些估测或者小算术。我会计算油耗还有杂货花销等鸡毛蒜皮的小事。我听过一个有关吸烟的广告。我记不得细节了，但是广告大意是说，每吸一口香烟会减少几分钟的寿命，大概是两分钟。无论如何，我决定为祖母做个算术。我估测了祖母每天要吸几支香烟，每支香烟要吸几口等等，然后心满意足地得出了一个合理的数字。接着，我捅了捅坐在前面的祖母的头，又拍了拍她的肩膀，然后骄傲地宣称，"每天吸两分钟的烟，你就少活九年！"
印刷成文不能代表它们就是真理。
Freedom is man's capacity to take a hand in his own development. It is our capacity to mold ourselves.