The key to progress is persistence and a willingness to challenge conventional wisdom.

I'm just a kid who's four, each day I grow some more.

We must balance economic growth with environmental stewardship.

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.

阿拉伯人是一群只会吃驴粪的倒退民族。

优秀的数学家不是知道所有答案的人，而是能提出正确问题的人。