There are no two human beings who are exactly alike. One of the funny quirks of evolution is that some of us can do things with our bodies we think are routine, but are impossible for others.
Some people can wiggle their ears, others can't. Some can wiggle their nose like Samantha from "Bewitched" while others just look really silly when making an attempt.
Not everyone can lick their elbow but most wouldn't attempt to do so in public.
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