Sustainability isn't an option—it's an imperative for the future of energy.

Human beings are not born once and for all on the day their mothers give birth to them, but life obliges them over and over again to give birth to themselves.

Success is not final, failure is not fatal: It is the courage to continue that counts.

Every word is a step towards understanding, every sentence a bridge to another soul.

And when his audience grew bored, he would spring into the air and do a back flip with a half twist.

I'm not trying to be cool. I'm just being me.

一个好的理论物理学家必须能够计算一切，但什么都不理解。