Why we smile on Facebook - Finding Your Science

Political scientist James Fowler makes the connection between smiling profile pictures on Facebook and human evolution.

Finding Your Science engages the greatest minds in science to share with you their passion, perspective and inspiration for making breakthrough discoveries.

Finding Your Science is a production of National Science Foundation (NSF) and is available for viewing on the NSF Facebook page, at http://www.facebook.com/US.NSF and YouTube channel, at http://www.youtube.com/user/VideosatNSF. Follow NSF on Twitter, at http://twitter.com/NSF and be the first to hear about new episodes.