Why Are Yawns Contagious? Even Your Dog Catches Your Yawns

Someone yawns... and seconds later, so do you. (Maybe you just did.) Why are yawns contagious? Who catches them most, why does trying to resist make it worse, can dogs catch human yawns, and why do we yawn at all? Sources: Bartholomew & Cirulli, PLoS ONE 2014 · Norscia & Palagi, PLoS ONE 2011 · Brown et al., Current Biology 2017 · Joly-Mascheroni et al., Biology Letters 2008 · Gallup & Gallup, Evolutionary Psychology 2007 #yawning #brain #science