Doppelganger comes from Germany, where  doppel  means  double  and  ganger  is a  walker,  that is, a person who looks like you.  If you encounter your doppelganger, recent  scientific evidence  indicates that you probably have similar genetics. We all have hair in the same area of the body and the same number of limbs, eyes, nose, and so on.  With 8 billion of us living on the same planet, it's only to be expected that some will have physical counterparts.   Let's take someone at random.  Say, the writer Ernest Hemingway, who passed away around 60 years ago. In 1977 an International Imitation Hemingway Competition began in Harry's Bar and American Grill, Century City, California.  The winner got two round-trip tickets to Florence, Italy, and dinner for two at Harry's.  Not sure why, for the  Harry's Ba r where Hemingway drank was in Venice.  The contest is now held at Sloppy Joe's in Key West, where he frequented for a dozen years when he lived there.  Actually