Why We Yawn—And Why Yawning Is So Contagious [Giz Explains]

Your grandmother says it's because you watch too much TV. Your teacher thinks it's because you're bored. And that creepy guy on the bus just slapped you with a phonebook in an attempt to exorcise the devil living in your molars. All because you're yawning. More »

Source: http://feeds.gawker.com/~r/gizmodo/full/~3/GdqcVbCV2MQ/why-we-yawnand-why-yawning-is-so-contagious

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