Seeing double: Do we all have a doppelgänger?

Is there really a copy of each of us out there or are our faces completely unique?

Applicance of Science: Seeing double: do we all have a doppelgänger?

Identical twins may be familiar with seeing their image reflected back at them from another person’s face, but for the rest of us, we assume this will never happen. There are however many reports of people coming face to face with a total stranger who looks just like them. They’re looking at their doppelgänger; Does everyone have one and what has science got to say about it?

What is a doppelgänger?