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Natural experiments are a powerful tool for understanding causal relationships in the real world.

I like everything that has no style: dictionaries, photographs, nature, myself and my paintings.

最好的故事不是來自“好與壞”，而是來自“好與好”。

If you don't fail at least 90 percent of the time, you're not aiming high enough.

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You are never too old to set another goal or to dream a new dream.