The solution is so simple, give us $2, we'll give you a ticket and yet it takes nine steps to do that.

解决方案也简单，给我们2美元，我们将给你一张票,但是你需要9个步骤来处理。

哈佛公开课 - 计算机科学课程节选

And the Bacon number is the number of steps it takes for them to get to Kevin Bacon.

这个Bacon数就是通过几度,他们就能与Kavin，Bacon连接上。

耶鲁公开课 - 心理学导论课程节选