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Original Resolution: 612x612 16 864 Yawning Photos And Premium High Res Pictures Getty Images Yawning has puzzled scientists for more than two millennia. 300x225 - In fact, the powerful contagious nature of yawning has puzzled researchers for i didn't see this person yawn but i still heard the distinctive sound and i soon realized that i couldn't stop myself following suit.
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Original Resolution: 390x280 Q Pxeb7300uqpm Tired woman working at office desk. 900x550 - Yawning (oscitation) most often occurs in adults immediately before and after sleep, during tedious activities and as a result of its contagious quality.
Original Resolution: 900x550 What Is Contagious Yawning And Why Autistic People Aren T Susceptible To It Siowfa15 Science In Our World Certainty And Controversy Media in category yawning people. 1000x750 - In fact, the powerful contagious nature of yawning has puzzled researchers for i didn't see this person yawn but i still heard the distinctive sound and i soon realized that i couldn't stop myself following suit.
Original Resolution: 1000x750 What Your Yawn Says About You But could a new theory settle the question once and for all? 702x336 - In fact, the powerful contagious nature of yawning has puzzled researchers for i didn't see this person yawn but i still heard the distinctive sound and i soon realized that i couldn't stop myself following suit.
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Original Resolution: 1300x1087 Two People Yawning Stock Photo Alamy Yawning most often occurs in adults immediately before & after sleep, during tedious activities & as a result of its contagious quality. 224x155 - A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the eardrums, followed by an exhalation of breath.
Original Resolution: 224x155 Why Do We Yawn Yawning most often occurs in adults immediately before & after sleep, during tedious activities & as a result of its contagious quality. 
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