Silence can sometimes be more powerful than words.

当儿童还没有发展起控制能力的时候，“让儿童想干什么就干什么”是与自由观念相违背的。

"I guess that’s just part of loving people: You have to give things up. Sometimes you even have to give them up."

The beauty of physics lies in its ability to explain the complex with simple laws.

技术应该服务于人类，而不是支配人类。