"It's important to write about difficult subjects in a way that children can understand."

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.

We are what we pretend to be, so we must be careful about what we pretend to be.

Innovation is not just about technology; it's about changing the way people think about dairy.

Time is what keeps everything from happening at once.