自然實驗是理解現(xiàn)實世界中因果關系的強大工具。
Natural experiments are a powerful tool for understanding causal relationships in the real world.
創(chuàng)作的行為是一種超越的行為。
譯文：親近賢臣，疏遠小人，這是西漢興盛的原因;親近小人，疏遠賢臣，這是東漢衰敗的原因。
Diversity in science leads to better solutions.
Being busy is a form of laziness—lazy thinking and indiscriminate action.