Natural experiments are a powerful tool for understanding causal relationships in the real world.
"I write to destroy the game, but I always end up creating it."
文学是社会的镜子,以毫不退缩的诚实反映其美德和恶习。
Innovation is not just about technology—it’s about mindset.
"You can't do anything about the length of your life, but you can do something about its width and depth."