why do we yawn?

[geff_p]

What is a yawn, why do we do them? Why do we copy people doing them?

[weeal]

was gonna say lack of oxygen but read this lol

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

very interesting tho it might make you yawn

[geff_p]

haha brilliant! i challenge any1 to read tht without yawnin too!

[unrulyjulie]

Im sure you got me on this last week geff! I sat yawning then and im doing it now!

[poohshunny]

I yawned when I read this. I then read it out to my my hubby and he yawned too! Ha ha