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2. The Brain-Cooling Process

Think about it: as your body physically yawns, you experience a powerful stretching of the jaw. This motion increases blood flow throughout your neck and into your face and head. Next, you take a deep breath. This intake forces spinal fluid and blood from your brain to flow in a downward spiral. Finally, the air that you breathed in cools these fluids as part of the brain-cooling process.

brain-cooling yawn

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