You can't knock on opportunity's door and not be ready.

I’ve had people look down on me and put me down because I didn’t look like them—but that didn’t stop me.

我是个南方女孩...我爱吃！

能源危机是一个可以解决的问题——如果我们现在行动的话。

Human cognition is best understood as a hierarchy of information processing levels.

Understanding the real lives of the poor is the first step toward designing effective policies to help them.