Why Is Yawning Contagious?

LINKS TO LEARN MORE: Vsauce SHIRTS: Other peeps in this video: Charlie: Alex: Yawning to cool down your brain: and: More on yawning and empathy here: here: and here (for the journal article): :doi/ Angry Mob play-set (no longer available): PARAKEET YAWN: BETTA FISH YAWN: SNAKE YAWN: .