There is nothing more discouraging in human discourse than someone yawning in your face while you're speaking to him.� "Oh, excuse me," he might say, "I guess I'm just very tired."� (Yeah, sure!)
But now, scientists have evidence that your listener may not be bored at all; but just chilling... his brain.��
Source: http://inventorspot.com/articles/scientists_witness_brain_chilling_yawns
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