The ultimate test of any economic theory is whether it improves real-world decisions.

Don’t stop when you’re tired. Stop when you’re done.

"Imagination is the key to unlocking the world."

The complexity of viruses reminds us how much we still have to learn about biology.

最成功的社会是那些能够在强大国家的需求与个人自由的需求之间取得平衡的社会。