"The problem with being faster than light is that you can only live in darkness."

So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.

元素周期表没有改变，但我们使用其元素的方式必须改变。

In mathematics, the most profound ideas often arise from the simplest observations.

I'm interested in the idea of the ecosystem as a form of intelligence.

艺术家必须是未知的朝圣者。

Investing in cleaner coal technologies is an investment in our future.

死亡是存在的最高可能性。