The only way to learn mathematics is to do mathematics.
最大的风险是不冒险。
The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.
The art of algorithm design is not just in solving problems, but in discovering new ways to think about them.
A good film is one that leaves you thinking long after it's over.