"Time is the thing that keeps everything from happening at once."

能源安全就是国家安全。

Sustainability isn't a choice—it's our responsibility to future generations.

Dreams are the driving force of life, without dreams there is no direction.

"Books are the quietest and most constant of friends."

I’m not afraid of dying, I’m afraid of not trying.

"The imagination is a muscle. If you don't use it, it atrophies."

Chance is a word void of sense; nothing can exist without a cause.

The laser is to attosecond physics what the telescope was to astronomy.