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Similar to the howling of the wolf pack, which is designed to synchronize mood in gregarious animals, yawning would have signalled tiredness to other members of the tribe thousands of years ago.
for more: http://thezenstones.blogspot.com/2011/11/why-is-yawning-contagious.html
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Related Questions
What is the coldest state in the contigous US?
Minnesota.
What is the second highest peak in the contigous?
none
What is the eastern most state in the contigous US?
main
Why is yawning not contagious to people with autism?
Yawning is not a disease.
Is yawning rude?
if rude and yawning are defined as such i don't see any reason why the act of yawning be rude. yawning is physiologic. would urinating and defecating be rude also?
What is the spelling of the yawning sound?
The spelling of the yawning sound is "yawn."
Which of the 48 contigous states has the largest land area?
Texas
Which state of the contigous 48 states is farthest east?
Maine
Witch contigous states in the US border the pacific ocean?
jamaka
How do you pronounce contigous?
Contiguous is pronounced kon teeg yew us
Is it true that the Sahara is larger than the 48 contigous US?
yes.
Which of the forty egiht contigous states has the largest land area?
texas
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