Why Is Yawning Contagious?

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Vsauce SHIRTS: http://www.districtlines.com/vsauce

Other peeps in this video:

Charlie: http://www.youtube.com/charlieissocoo...
Alex: http://www.youtube.com/nerimon

Yawning to cool down your brain: http://well.blogs.nytimes.com/2011/10...

and: http://dsc.discovery.com/news/2008/12...

More on yawning and empathy here: http://tlc.howstuffworks.com/family/c...

here: http://news.bbc.co.uk/1/hi/6988155.stm

and here (for the journal article): http://www.plosone.org/article/info:d...

Angry Mob play-set (no longer available): http://www.neatoshop.com/product/Angr...

PARAKEET YAWN: http://www.youtube.com/watch?v=nFiT6Q...

BETTA FISH YAWN: http://www.youtube.com/watch?v=FsBTwc...

SNAKE YAWN: http://www.youtube.com/watch?v=Fhfss_...

"Why Are Yawns Contagious" "Why is yawning Contagious" "why do we yawn"

Music by Jake Chudnow: http://www.soundcloud.com/JAKECHUDNOW

intro animation by http://www.youtube.com/rickonami

• Category

  Science & Technology

[TheKazyProductions]

I yawned 13 times during this video

[Stuugie]

I want to know why my eyes water up when I yawn?

[Scott ReviewsStuff]

I yawned before the fucking thing even started.

[emptyness7]

I DO yawn when I exercise.

[ZnXii]

yawned 5 times going to stop watching this vid now

[Austin Aitchison]

why when i stretch i fall over

[Elika Portman]

i yawned just by reading the title :O

[ChineseBumRape]

*yawn*

[LUXITANE]

Yaaaaaaaaawn

[PizzaMan359]

Same bro! I've always thought i was the only person when i read or hear the word (just yawned then) yawn or a pic of someone yawning!

[Caleb Humphreys]

That was no parakeet that was a budgie :/

[Perforated611]

I tried to watch this shortly before bed, I failed.