Why if one yawns fellow next to him also yawns why it is so contagious?
Contagious yawning has been defined as a sign of empathy and a form of social bonding. It is the subconscious action by the brain to interpret and mimic another person's action. This is why yawning is contagious.
Huh I can't recall why buy they proved that it is on myth busters had lots of different people in different rooms and they all yawned heck I yawned when I saw them yawn lol
I yawned while reading your post.
Just reading the word Y-A-W-N does make you yawn :)