Disruptive innovation starts with questioning why things are done the way they are.

The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome of the historical process.

数学不是关于数字、方程、计算或算法的：它是关于理解的。

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.