睡得早起得早，使人聪明、富有、身体好。

Natural experiments are a powerful tool for understanding causal relationships in the real world.

做出伟大工作的唯一方法就是热爱你所做的事情。

To write is to engage with the world.

Technology alone won't solve our challenges—it's how we apply it that matters.

Your most unhappy customers are your greatest source of learning.