Yawning may help you keep a cool head—literally, a new study suggests. The findings might hold some hope for sufferers of insomnia, migraines, and even epilepsy.
NatGeo: Why do we yawn? It may keep our brain cool
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Seeded by Jaime 777 View Original Article: 
National Geographic
Seeded on Wed Nov 16, 2011 9:26 AM
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