有一个人从天堂来到人间旅游，他所使用的是有效三十天的减价票，他试图要把他的回程票卖掉。
Ingersoll's story of the man that went down from heaven on a reduced-rate excursion ticket good for 30 days --- and tried to sell his return ticket.
未来属于今天为之准备的人。
成功不是终点，失败也不是致命的：重要的是继续前进的勇气。
I'm not a emotion, I'm a idea.
Never， never， never give in！
The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.