Yawing Frequency Chart (IMAGE)

Princeton University

Yawing Frequency Chart

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People yawn less frequently when outdoor temperatures exceed body temperature, suggesting that yawning could be a natural brain-cooling mechanism, Princeton University and University of Arizona researchers reported. They recorded yawning frequency in 160 people in summer and winter in Tucson, Ariz., 80 for each season. They found that nearly half of participants yawned in winter, opposed to less than a quarter in the summertime.

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Image by Andrew Gallup

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