Self Sharpening Knives

As the experiment was designed, the groups consisted of "liberal" and "conservative" enclaves — the former from Boulder, the latter from Colorado Springs. It is widely known that Boulder tends to be liberal, and Colorado Springs tends to be conservative. Participants were screened to ensure that they generally conformed to those stereotypes. People were asked to state their opinions anonymously both before and after 15 minutes of group discussion. What was the effect of that discussion?

In almost every case, people held more-extreme positions after they spoke with like-minded others.

So go ahead and read only what agrees with you. It will make you more yourself. Or will it?