Kieran+-+Wonders+of+Science

WONDER QUESTION: Why do we yawn? []
 * One reason we yawn is that we are In need of oxygen.
 * We yawn when our brain contains large amounts of carbon dioxide.
 * You yawn when you are tired.
 * Yawning controls brain temperature.
 * You yawn when you are getting bored.
 * You sometimes yawn when you get dizzy.

Get out a piece of paper and a pencil, and then check out this site. VERY INTERESTING! []

