Why is Yawning So Contagious?

Scientists don’t exactly know yet, but here are some theories

Photo by Tim Bish
A most befitting member of the yawn society

“A yawn might be a special kind of respiration, one that builds up oxygen quickly, while expelling carbon dioxide, even more than a deep breath”

The yawning contagion in week-old kittens
Here’s a cross-species yawn caught on tape

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