Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

硬件是创新的骨架，软件是它的神经系统，而人类需求才是它跳动的心脏。

The great challenge of our time is to build institutions that can manage the complexity of modern societies.

知识最大的敌人不是无知，而是知识的幻觉。