I understand now why yawning is contagious. This video explains so much about why yawning is contagious and it's a good thing that I am not yawning while watching it but after thinking about it, I yawn. It's really funny to see someone yawning then after awhile you yawn too but I think you can't stop it because your not thinking about mimicking someone instead it comes out naturally.
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From @melaniecarpio