“I saw someone who looked just like you!”

You’ve probably heard that at least once in your lifetime.

But are people who look exactly like us possible?

This is a phenomenon called a doppelganger or twin strangers, a non-biologically related lookalike or double of a living person.

With more than seven billion people on the planet, there has to be your doppelganger out there.

Dr Arthur Beaudet, a professor of molecular and human genetics at Baylor College of Medicine in Houston said: “You find two people from similar descents who probably do, in fact, have a fair amount of genetic sharing when you go way back.

Scientists have no idea how many genes play roles in establishing, for example, the shape of human faces or the space between people’s eyes. – LIVESCIENCE