Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.

大脑是一个复杂的系统，我们才刚刚开始理解它是如何工作的。

创新不仅仅是创造新产品，而是重新构想我们如何生活和工作。