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On marketing: "In the old world， you devoted 30% of your time to building a great service and 70% of your time to shouting about it. In the new world， that inverts."

The true test of a mathematical idea is its ability to inspire further thought.

"She was free in her wildness, she was a wanderess, a drop of free water. She belonged to no man and to no city."

我盡量選擇能挑戰我并讓我學到東西的角色。