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"Kids are the toughest audience, but also the most rewarding."

The only way to have a friend is to be one.

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

創新不僅僅是創造新事物，而是要對人們的生活產生影響。

Sir, where are you running? Are you doing this for world peace? Are you doing this for the homeless? Are you running for women's rights? The environment? They just couldn't believe that somebody would do all that running for no particular reason. Why are you doing this? I just felt like running. I just felt like running.

旅行就是發現每個人對其他國家的看法都是錯誤的。