我们在任何地方都能发现它们：在书籍、报纸上，在街上，在我们生活和工作的地方的墙上。
We find them everywhere: in books and newspapers, in the street, and on the walls of the places where we live and work.
三千年前，在如今被我们称之为罗马的地方，印欧人聚集在一起，一起打猎，一起生活，一起照顾彼此。
Three thousand years ago, in what today we call Rome, Indo-Europeans connected to hunt, survive and generally look out for one another.
在我们的日常生活里我们很可能从不同的地方听到过类似的观点，我们于是自动把这些拼凑起来成为群体的倾向。
In everyday life we are likely to hear the same opinion many times in different places. We then put all these together to judge the general mood of a group.
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