自然和历史是地理知识的两个重要来源。

I don't want to be better than anyone else, I just want to be better than myself.

所谓现实只不过是一个错觉，虽然这个错觉非常持久。

Never stop learning, because the world never stops changing.

If you’re horrible to me, I’m going to write a song about it, and it won’t be a good one for you.