Plenty of people have heard about how yawning is contagious. You see someone else do it and u get the sudden urge to do it yourself. The reason people have this contagious yawning effect is because when your mind sees someone else do it your brain has a reaction that causes you to yawn in an involuntary empathetic way. This reaction is also demonstrated in chimpanzees, baboons, and dogs. Now this develops as you get older so children of a very young age do not have this reaction but it is developed with time. A resent study shows that like us puppies also have this process development. very young puppies are not contagious i guess you could say. i guess dogs are mans best friends.
.http://www.youtube.com/watch?v=jFqV4Mtj8pY
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