Violence is not just physical; it's embedded in our systems and structures.
在数学中，最简单的问题往往能引出最深刻的见解。
Change is not merely necessary to life—it is life.
可持续性不是一种选择；它是我们星球未来的必需品。
It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.
