Natural experiments can provide valuable insights into economic questions.

To write is to rewrite.

Sustainability isn't a cost—it's an investment in our future.

Behavior is a function of the field at the time the behavior occurs.

石油行业的未来在于高效、清洁、低碳，我们要在传统能源和新能源之间找到平衡点。

最好的故事是那些让你有所感受的故事。

"We are all in the gutter, but some of us are looking at the stars."

"The immune system is the key to fighting cancer."