Why Do We Yawn yawning yawn sciencefacts brainhealth

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=s1lVqxwgKMw

Yawning: It's more than just a sign of tiredness! • Yawning helps our brains by increasing oxygen and cooling them down. Learn the surprising science behind it and why it's contagious! • Watch now and share your thoughts in the comments below! • #yawning #yawn #sciencefacts #brainhealth • ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ • Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for fair use for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational, or personal use tips the balance in favor of fair use.

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