Science : wtf is up with YAWNING?

wtf is up with YAWNING?

I know what a yawn is, but what I mean is why do we start to yawn when we see others yawn? Have u ever experienced it? You are not even tired in the slightest but you see ur friend yawn and all of a sudden YOU are yawning? wtf is up with that? and why is it only that certain bodily function? why do we not fart when we see others farting? that would at least be funny, if not a bit smelly. I blame Muslims, somehow.
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