今天我们来看看@大数定律与中心极限定理 提的话题：how to make a difference
be kind to others 对别人友善
In this busy world people become self consumed and forget that kindness goes a long way.
在这个繁忙的世界，人们变得以自我为中心，都忘了友善大有帮助。
When you see a friend, or a coworker, or a classmate, smile and say hello.
