Nov 082013
 
Why Is Yawning Contagious

Back in May, YouTube prankster Roman Atwood traveled the world, and took advantage of his trip to get people across the globe to ‘catch’ his yawn. And it worked, as the subsequent video garnered over 4 million views.

Now, educational channel TED-Ed has gone viral with a more scientific approach to the yawn, and explains why yawning is so contagious