Why do we yawn? Contrary to popular belief, it's not because our brain needs more oxygen! You'll find out why we yawn and why it makes everyone around us yawn in this funny, informative video.
Channels: Neuroscience-Neurobiology Interesting Science Others
Uploaded by: layne.ransom.5 ( Send Message ) on 26-11-2012.
Duration: 5m 45s