Manual create account
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.
You need to login to download this video.
login or signup
Neuroscience-Neurobiology Interesting Science Others
Tags: yawn brains sleep
( Send Message ) on 26-11-2012.
Duration: 5m 45s