Uncle Arden invites you over to watch the World Cup and tells you to bring some friends. When you get there, you see that there are several people you know (relatives, family friends, etc.), and some you don't know.

It's a lively bunch and over food and the game on TV, lots of topics are covered, including soccer and politics. As you would expect, you have similar opinions as your friends and relatives and you disagree with some of them. You actually have more in common , in terms of soccer and politics, with some strangers you just met today than you have with some of your friends and relatives.

When it comes to the people in the room, you have essentially four possible connections as shown..

69. The Brain Responds uniquely to people you know personally.