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why do we yawn?

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geff_p | 11:20 Sun 24th Feb 2008 | ChatterBank
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What is a yawn, why do we do them? Why do we copy people doing them?
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was gonna say lack of oxygen but read this lol

http://en.wikipedia.org/wiki/Yawn

very interesting tho it might make you yawn
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haha brilliant! i challenge any1 to read tht without yawnin too!
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Im sure you got me on this last week geff! I sat yawning then and im doing it now!
I yawned when I read this. I then read it out to my my hubby and he yawned too! Ha ha

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why do we yawn?

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