Why Do We Yawn?

http://news.nationalgeographic.com/news/2011/11/111115-yawning-mystery-brains-sinuses-health-science/?source=hp_dl2_news_yawning20111116
  Published on November 15, 2011
Why Do We Yawn?
Summary:
     As advanced as we already are in science, we cannot seem to figure out why humans yawn. There have been many theories put out from lack of oxygen to fatigue, yet when tested, they failed. So, scientists continued to find a cause of the yawn. Gary Hack and his team discovered that the back wall of the sinus was much thinner than was described before. Andrew Gallup and his team put probes into rats brains, recording temperature changes before, during, and after the rats yawned. That was an attempt to see if yawning cools the brain. They also tried their theory with a human who yawned consistently, and the temperature did indeed change. Since their theory has only been tried a few times, they are hesitant to announce that they have found the cause, but they do believe if this was to be defined, it would lead to strides in diagnosing conditions such as epilepsy and migraines, even insomnia. 
Connection:
     This article is about potential causes of yawning. Yawns are generally considered automatic involuntary actions of the body. Yet, this article makes an interesting connection between yawns and the brain. The brain, with its many parts, controls the involuntary and voluntary actions of the body. It is part of the nervous system, which we learned earlier in this year. The article connects yawning to the brain as it might be a potential way for the brain to cool itself, much like a computer uses a fan to cool its inner hardware.