Is yawning contagious?

Is yawning contagious?
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1 Answer

Answer :

I’ve heard of research that says that yawning has something to do with pheromones and how people cooperate. It’s sorta like an appendix: we don’t need it anymore, but it’s still there. This research was on an English exam for one of the readings, but I forget who the author is. The author studied hippopotamuses and other pachyderms and related the findings to humans and dogs.
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