Why Do we Yawn ? Why is Yawning Contagious ?

Yawwwwwnnn!!! Hey Don't sleep off !! Aren't you eager to know why & when do we end up yawning? Watch "why do we yawn ?" video & we are sure the next time you yawn you'll know why it's happening. Won't that be exciting? So watch it now!!

All Voices: Tulsi Kumar ツ


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