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Result : 1 post(s) tagged with temperature theory

Why is Yawnig So Contagious?

Posted by srmcurology on Sat, 06 Nov 2010

Yawning commonly occurs when we are tired or drowsy. People also yawn when they are bored. Why do we yawn and what is its exact purpose is still an unresolved mystery. Everyone yawns - babies to adult...

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