Objects have always been carried, sold, bartered, stolen, retrieved and lost. People have always given things to other people.

Every challenge is an opportunity in disguise.

The intersection of mathematics and computer science is where some of the most exciting discoveries are made.

凡是能够说的，都能够说清楚；对于不可说的东西我们必须保持沉默。

"I think that mathematicians are much more like artists than they are like scientists."