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Three things you need: The ability to not give up something till it works， the ability to give up something that does not work， and the trust in other people to help you distinguish between the two.

數學不是關于數字、方程、計算或算法的：它是關于理解的。

最好的投資是投資自己。

I think of a hero as someone who understands the degree of responsibility that comes with his freedom.