Why do we yawn - and why is it contagious?

Dr. Jen Caudle explains the reasons we yawn and why it seems contagious. She describes yawning as the body “running the air conditioning in your head.” Here’s how it happens: “Yawning stretches your jaw, increasing blood flow in your neck, face and head. Then a deep breath sends a rush of cool air to the spinal fluid and the brain.”
This video was originally published on Yahoo Life on Dec. 2, 2022: yhoo.it/3HSppaW
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