Why is yawning contagious?
Why do we yawn when we see some one else yawn?
How does yawn spread?
Can you watch this without yawning.
I bet i can make you yawn.
#Yawning
#yawn
#sleepy
#whydoweyawnwhenweseesomeoneelseyawn
#tired
#mirrorneurons
#yawningvideo
#peopleyawning
#contagiousyawning
#Whydoweyawn
#whyareyawnscontagious
#whyyawnsspread
#yawnbombing
#wayofconnecting
#empathizing
#strengtheningsocialbonds
#trynottoyawn
#whyisyawningcontagious
