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.

反馈是一个强大的概念，在自然系统和技术系统中被广泛使用。

I stand up for what I believe in, and I don’t worry about what others think.

"Mathematics is the science of patterns, and nature exploits just about every pattern that there is."

Great teams are built on mutual respect and shared goals.

预测未来最好的方式就是创造它。

能源的真实成本必须同时考虑其生产和遗留影响。