"We are all the sum of our contradictions - that's what makes biography so fascinating."

When buying a garden hose， an extension cord， or a ladder， get one substantially longer than you think you need. It’ll be the right size.

纸的未来不是取代数字；而是共存并互相增强。

I want to liberate America from all the things that hold people back.

The boundary between physics and mathematics is not as clear-cut as we might think.

心理学的研究就是研究生活中的行动。