A new study found out, kinda, why we yawn... As we all know, at least most of us, the brain is more or less like a computer. It has the power to run multiple calculations and tasks at one time. A task that not even a room full of the world's most powerful computers can handle. All that power makes heat. Well, the study says that the reason why we yawn is because our brain is heating up. I for one did notice that when I breath through my nose, my yawning stops. This is because fresh or cooled air is in contact with the base of the brain and dispersing that coolness to the rest of the brain.

Click The Yawn Explained from Discover News for more information. You just might learn a bit more than I did :)