Oct 14, 2015 by
Researchers used to believe that yawning was a way to further oxygenate our brains, but recent studies suggest that this may not be the case. To find out the answer, watch the video below!
https://youtube.com/watch?v=I0dQx4SNSwE%3Frel%3D0%26showinfo%3D0frameborder%3D0allowfullscreen
