The true value of a forest is measured not just in board feet of timber, but in the lives it sustains and the ecosystems it supports.
理解宇宙就是理解我们自己,因为我们都是由形成恒星的星尘构成的。
改变的秘诀在于集中你所有的精力,不是对抗旧的,而是建立新的。
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.