The most successful hyperpowers are the ones where there was actual intermixing. Tang dynasty China was Chinas golden age, and contrary to what I was told when I was growing up, Tang China was founded by a man who by todays standards was no more than half Chinese. It was a mixed-blood dynasty that pulled in "barbarians" from the steppe.

Don't assume your child is weak. If you, the parent, assume that they can't take anymore, what kind of signal are you sending them?

The fact is that Chinese parents can do things that would seem unimaginable-even legally actionable-to Westerners. Chinese mothers can say to their daughters, "Hey fatty-lose some weight." By contrast, Western parents have to tiptoe around the issue, talking in terms of "health" and never ever mentioning the f-word, and their kids still end up in therapy for eating disorders and negative self image.

When my kids wanted to give up on things, I wouldn't let them, and those are lifelong lessons.

I see my upbringing as a great success story. By disciplining me, my parents inculcated self-discipline. And by restricting my choices as a child, they gave me so many choices in my life as an adult. Because of what they did then, I get to do the work I love now.

I do play tennis, but I don't really like competition. I'm supposed to be so intense, but I hate competition.

There's nothing better for building confidence than learning you can do something you thought you couldn't.