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  2. Why do we yawn — and why is it so contagious? Experts explain.

    www.aol.com/lifestyle/why-yawn-why-contagious...

    Merely thinking about or seeing someone yawning can make you yawn. But why?

  3. Why you yawn when you’re bored, according to experts - AOL

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    Reasons we we yawn. It was once believed that the main function of yawning was to increase otherwise low oxygen levels, but a 1987 study disproved that theory. And despite extensive additional ...

  4. Yawn - Wikipedia

    en.wikipedia.org/wiki/Yawn

    Snakes yawn, both to realign their jaws after a meal and for respiratory reasons, as their trachea can be seen to expand when they do this. Dogs, and occasionally cats, often yawn after seeing people yawn [11] [65] and when they feel uncertain. [66] Dogs demonstrate contagious yawning when exposed to human yawning.

  5. Why do we yawn — and why is it so contagious? Experts explain.

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  6. Exhalation - Wikipedia

    en.wikipedia.org/wiki/Exhalation

    A non-respiratory gas movement is another process that moves air in and out of the lungs that do not include breathing. Yawning is a reflex that tends to disrupt the normal breathing rhythm and is believed to be contagious as well. [14] The reason why we yawn is unknown.

  7. Talk:Yawn/to do - Wikipedia

    en.wikipedia.org/wiki/Talk:Yawn/to_do

    Which animals yawn, and has it evolved independently more than once? A little further explanation as to how yawning is advantageous - how would an organism that didn't yawn/respond to yawns be more likely to die? Physiologically, what is the difference (if there is any) between a true reflexive yawn and a voluntary effort to simulate a yawn?

  8. Why is yawning contagious? Here are all the facts about your ...

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    Wondering why you always yawn when other people do? Catch your dog yawning at the same time? Find out why the tired reflex is so contagious.

  9. Wikipedia:Reference desk/Archives/Science/2010 January 30

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    In the future, please give us a chance to answer your question before assuming that we won't do so properly. Physics is separate from logic. We can easily conceive of different physical constants and even altogether different physical laws, but I certainly can't conceive of what it would mean to change logic.