20050312 (J)
Journal: March 12, 2005
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Science (origin of yawning)

Origin of Yawning (?): When we yawn we bare our teeth as if to say, “Don’t try it”. We do it when we are tired because we are about to sleep, hence become much more vulnerable. So to warm would be predators or thieves in the vicinity, we show them our teeth (weapons) and signal them to stay away for their own good in that we can hurt them.