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contagious

  1. Admin

    Why We Yawn? Is Yawning Contagious?

    What is a yawn and why do people yawn? Yawning has fascinated people for hundreds of years, and many superstitions and myths have been created over the years. Today we know that a yawn is a reflex of inhalation and exhalation that draws more oxygen into the bloodstream. A reflex is a...
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