Why Is Yawning Contagious?
Contagious yawning can be annoying, but it might also be a sign of good social skills. It’s a type of emotional contagion, a phenomenon in which we tend to share the feelings of people around us. Scientific American MIND editor Sandra Upson explains in our latest Instant Egghead video
http://blogs.scientificamerican.com/observations/why-is-yawning-contagious-video/
