Yawning
Virtually all animals with a backbone yawn, but scientists don’t know what purpose it serves or why yawns are so contagious.
In Good Health · Greg Johnson, Elizabeth Westfield, Maayan Voss de Bettancourt | AURN
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Show Notes
Virtually all animals with a backbone yawn, but scientists don’t know what purpose it serves or why yawns are so contagious.
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