Why Do We Yawn? http://www.twitter.com/Tweetsauce Vsauce SHIRTS: http://www.districtlines.com/vsauce Other peeps in this video: Charlie: null Alex: null Yawning to cool down your brain: http://well.blogs.nytimes.com/2011/10/03/really-the-claim-yawning-cools-the-brain/ and: http://dsc.discovery.com/news/2008/12/15/yawn-brain-head-02.html More on yawning and empathy here: http://tlc.howstuffworks.com/family/contagious-yawn.htm here: http://news.bbc.co.uk/1/hi/6988155.stm and here (for the journal article): http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0028472 Angry Mob play-set (no longer available): http://www.neatoshop.com/product/Angry-Mob-Playset PARAKEET YAWN: https://www.youtube.com/watch?v=nFiT6QaOnZM BETTA FISH YAWN: https://www.youtube.com/watch?v=FsBTwczonE4 SNAKE YAWN: https://www.youtube.com/watch?v=Fhfss_LYqZA "Why Are Yawns Contagious" "Why is yawning Contagious" "why do we yawn" Music by Jake Chudnow: http://www.soundcloud.com/JAKECHUDNOW intro animation by null