Why Do We Yawn?

What makes yawning so contagious? Watch the ’Yawn-O-Meter’: SUBSCRIBE: Instagram and Twitter: @whalewatchmeplz and @mitchellmoffit Clickable: and Facebook: Twitter: Tumblr: Vine: Search “AsapSCIENCE“ on vine! Written and created by Mitchell Moffit (twitter @mitchellmoffit) and Gregory Brown (twitter @whalewatchmeplz). Further Reading -- Yawning as