Not sure if this is proper section but, why is it that when someone yawns even if you dont feel tired you have to yawn yourself. Also if someone does a pretend yawn or an animal or baby yawns, it doesnt make you feel like you have to do one too?
If you sit across a table from someone and have eye contact...... if u scratch ur nose they will scratch theirs, if u yawn they will then yawn , we are all just mimiking what we all see as appropriate sociable behaviour