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What makes us yawn and why does it seem to be contagious? ... Next time you're in a meeting, try this little experiment: Take a big yawn, cover your mouth out of courtesy, and watch and see how many people yawn. There's a good chance that you'll set off a chain reaction of yawns.
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www.howstuffworks.com/question572.htm
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Discover the reasons why people and certain animals yawn, whether yawns are really contagious and why a bout of excessive yawning could indicate a seizure. Everybody yawns, adults, children, infants and even some birds, reptiles and mammals...
http://anatomyphysiology.suite101.com/article.cfm/what_...
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Most people think it is that you are tired or there isn't enough oxygen coming to the brain. From recent studies it is because your head is over-heated.
http://wiki.answers.com/Q/Why_do_people_yawn
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[...] People begin to yawn early in their lives. Indeed, yawning has been observed in three-month-old fetuses — evolutionary evidence of how ancient the behavior is. It’s the contagious quality of the activity that’s especially intriguing. ...
http://atheism.about.com/b/2006/02/14/why-do-people-yaw...
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This is a very interesting question, but I'm afraid that the answer as to why we yawn is still quite a mystery to science. ... Thus, smiling is to let people know that you're happy, crying is to tell people that you are very sad (and possibly need help), the facial expressions of anger and to let people know that you are...
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www.madsci.org/posts/archives/aug99/934846431.Gb.r.html
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Although people often yawn at night before going to bed, studies have shown people yawn most within the first hour of waking up. Yawning is often a part of stretching and is considered to be a stretch of the face.
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www.members.shaw.ca/hilaryking/Oldbrain1.htm
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Dear Aubie, What makes people yawn? ... The average yawn takes about six seconds. Yawning is clearly contagious, meaning other people will yawn just because they see someone else yawn. In fact, more than half of the people who see someone else yawn will yawn themselves.
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www.auburn.edu/communications_marketing/askaubie/091504...
www.auburn.edu/communications_marketing/askaubie/091504.html
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All vertebrates yawn, and yawning persists in people who are in a vegetative state. Such universality suggests that yawning has a defensive or protective function. ... Abstract in English ..Why do people yawn ? ... Why do people yawn ?
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baillement.com/why.people.ywan.html
baillement.com/why.people.ywan.html
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Health question: Why do people yawn when they see someone else yawn? Answer (maybe) This is a nervous reflex of our brain, just like when someone tells you that he/she is hungry, even if you're not, you'll ... Answers.com > Wiki Answers > Categories > Health > Why do people yawn when they see someone else yawn...
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wiki.answers.com/Q/Why_do_people_yawn_when_they_see_som...
wiki.answers.com/Q/Why_do_people_yawn_when_they_see_someone_else_yawn
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