与那些挑战你的人为伍，而不仅仅是那些赞同你的人。
Surround yourself with people who challenge you, not just those who agree with you.
Natural experiments are a powerful tool for understanding causal relationships in the real world.
鱼是我所喜欢的，熊掌也是我所喜欢的，两种东西不能同时拥有，就舍弃鱼去取得熊掌。生命是我所喜欢的，义也是我所喜欢的，如果两种东西不能同时拥有，就舍弃生命去取得大义。
Innovation is not just about technology; it's about changing the way we think and operate.