可持续的做法不是成本,而是对我们共同未来的投资。
It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.
The truth is, I don't know what I would have done without mathematics.
金钱只是一个工具。它会带你去任何你想去的地方,但它不会代替你成为司机。