Take a deep breath: Scientists locate the part of the brain that controls sighs

Your life depends on your ability to sigh.

Yes, we sigh when we're exhausted or stressed -- and when the weight of the world feels like too much to bear -- but it turns out that sighing is also an essential life-sustaining reflex that is necessary to keep our lungs from collapsing.  

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via L.A. Times - Science http://ift.tt/23TjK9w