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The longer the yawn, the bigger the brain

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Yawning doesn't need be a sign of boredom. Rather, it appears to be a measure of brain size. Vertebrates with larger brains yawn longer, according to a study of more than one hundred species of mammals and birds. The findings of the study, which was conducted by an international team of scientists centered around biologist Jorg Massen of Utrecht University (NL) and Andrew Gallup of the State University of New York Polytechnic Institute (U.S.), were published on May 6, 2021 in the scientific journal Communications Biology.

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