Why We Yawn and Why It Is Contagious

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.

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Channels: Neuroscience-Neurobiology Interesting Science Others

Tags: yawn brains sleep

Uploaded by: ( Send Message ) on 26-11-2012. Dnatube suggest users to have interest in drug testing, mesothelioma, insurance, medical lawyers.

Duration: 5m 45s

Dnatube: Sciencific and Medical video site.