- It's common for people to form groups of like minded individuals who also have similar abilities. - Evolution confers advantages on heterogeneous groups of people and groups with diverse talent sets. - Prizing individual identity ahead of group identity also helps counteract tribalistic politics. Nicholas A. Christakis is a physician, sociologist, and director of the Human Nature Lab at Yale University, where he is the Sterling Professor of Social and Natural Science. His most recent book is Blueprint: The Evolutionary Origins of a Good Society (amzn.to/2VpXp3S) Follow him on Twitter @NAChristakis Read more at BigThink.com: bigthink.com/videos/tribalism-politics Follow Big Think here: YouTube: goo.gl/CPTsV5 Facebook: www.facebook.com/BigThinkdotcom Twitter: twitter.com/bigthink