I will hazard a prediction. When you are 80 years old， and in a quiet moment of reflection narrating for only yourself the most personal version of your life story， the telling that will be most compact and meaningful will be the series of choices you have made. In the end， we are our choices. Build yourself a great story.

种一棵树最好的时间是20年前，其次是现在。

我们在自然知识中前进得越远，就越发现最普遍的定律是最简单的。

人生太短暂，不能活在别人的梦想里。