In the end, all we have are words.

The unknown is not to be feared but to be explored.

地球是一个圆点。月亮是一个圆点。太阳是一个圆点。星星是圆点。

在一个普遍欺骗的时代，说出真相是一种革命行为。

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.