Art should create a kind of productive discomfort.

Climate models are like time machines - they allow us to peer into possible futures.

A true friend is someone who sees the pain in your eyes while everyone else believes the smile on your face.

The PAC learning framework provides a formal way to analyze the efficiency and effectiveness of learning algorithms.

The greatest thing you'll ever learn is just to love and be loved in return.

Immediately pay what you owe to vendors， workers， contractors. They will go out of their way to work with you first next time.

过去从未死去，它甚至还未过去。

解释：饿了再吃，粗茶淡饭味道也像吃肉一样可口。安稳走路就不会感觉到劳累，权当坐车。

宽容是自由社会的生命要素和标志，永远不会是当权者的恩赐；在多数人暴政的普遍条件下，它只能通过激进少数派的持续努力赢得。