每一天都是新的开始。

To feed the world, we must first understand it.

The beauty of mathematics lies in its ability to describe the universe with such precision.

如果你对我不好，我会写一首关于你的歌，而且不会是好话。

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.