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

不要害怕问愚蠢的问题。因为99%的情况下其他人也想问同样的问题，只是因为怕尴尬而羞于提问。

Running a business requires patience, not short-term gains.

"I wanted to write about the Windrush generation because their story is part of British history, but it's a story that hasn't been told enough."