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www.ask.com/world-view/people-yawn-same-time-40b45d7f1338c00

There are multiple theories as to why people yawn in response to seeing others yawn. One theory is that contagious yawning is a result of the power of suggestibility. Another theor...

Yawning can indicate boredom or tiredness.
There are many theories about why people yawn, but no one knows for sure.

Yawn

en.wikipedia.org/wiki/Yawn

This "contagious" yawning has also been observed in chimpanzees, dogs, and .... do not increase their yawning frequency after seeing videos of other people ...

Why We Yawn - WebMD

www.webmd.com/brain/news/20110923/why-we-yawn

Sep 23, 2011 ... People yawn more easily in cooler temperatures, supporting the idea that ... 23, 2011-- Why do we yawn? ... So do most vertebrate animals.

Facts About Yawning: Why We Do It, Why It's Contagious And More

www.huffingtonpost.com/2013/06/10/facts-yawning-why-we-yawn-contagious_n_3398301.html

Jun 10, 2013 ... We all do it, and we all know it has at least something to do with how tired ... In some people, excessive yawning could be a reaction caused by ...

What makes us yawn? | HowStuffWorks

science.howstuffworks.com/life/inside-the-mind/human-brain/question572.htm

Why do people blush? Why are humans altruistic? ... Now that we know what a yawn is, let's look at what causes us to do it. On the next page, we'll discuss four ...

The Real Reason We Yawn - WSJ

www.wsj.com/articles/the-real-reason-we-yawn-1408403897

Aug 19, 2014 ... Scientists working to unravel the mystery surrounding the yawn, and why it's contagious, have discovered that yawning is much more ...

Why do we yawn? Nothing to do with boredom - we're just cooling ...

www.independent.co.uk/news/science/why-do-we-yawn-nothing-to-do-with-boredom-were-just-cooling-our-brains-say-scientists-9356468.html

May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do ... a video of people yawning were 41 per cent likely to yawn themselves ...

Why Do I Yawn? - KidsHealth

kidshealth.org/kid/talk/qa/yawn.html

If you yawn in class, you'll probably notice a few other people will start yawning, too. Why is that?

BBC - Future - One of science's most baffling questions? Why we yawn

www.bbc.com/future/story/20140811-warning-this-may-make-you-yawn

Aug 12, 2014 ... And then you can ask people to experiment on their yawns – like closing the ... has tried to explore a millennia-old mystery: why do we yawn?

Popular Q&A
Q: Why do people yawn?
A: it is a sensor based on needing oxygen, probably from a time when we lived in caves. Read More »
Source: answers.yahoo.com
Q: Why do people yawn.....?
A: When you're bored, tired, sleepy etc. you breathe slightly slower than normal. The brain is deprived of much needed oxygen, no matter how small the amount missi... Read More »
Source: answers.yahoo.com
Q: Why do people yawned
A: Low oxygen in the blood causes people to yawn which brings in more oxygen & carries out carbon dioxide Read More »
Source: www.kgbanswers.com
Q: Why do people yawn?
A: Nobody knows for sure why we yawn, but the physiological theory is that we yawn to expel excess carbon dioxide. ! Read More »
Source: www.chacha.com
Q: Why Do People Yawn?
A: Everyone knows that yawns are contagious. A person will often yawn after seeing someone else do so. Even reading the word y-a-w-n can trigger the behavior. And ... Read More »
Source: www.associatedcontent.com