You’ve most probably heard the urban legend that everyone in the world has at least one doppelganger, or identical "twin" with whom they share no relations. Three friends from Dublin City University in Ireland used the power of the Internet to help find their doppelgangers, but is this just a coincidence or is there actually any scientific proof backing the doppelganger myth?

As part of their Twin Strangers challenge, three DCU students — Niamh, Harry, and Terence — gave each other one month to find their lookalikes. Niamh, 26, emerged as the first winner, finding Karen, a complete stranger with whom she shared a striking resemblance. After styling their hair and makeup in a similar fashion, Niamh and Karen looked nearly identical.

“She probably looks more similar to me than some of my sisters,” Niamh explained in the YouTube video documenting her first meeting with Karen.

So what does science have to say about the doppelganger legend? Dr. Daniele Podini, a forensic scientist and expert in facial recognition at George Washington University in Washington, D.C., told Science Line that it’s highly unlikely that doppelgangers exist, but statistically speaking, he can’t completely rule them out.

The problem with doppelgangers lies in the fact that appearance is largely based on personal perception. Science Line reported that although we all see the same features when looking at a face (eyes, nose, mouth, etc.), each individual brain takes in these features in a different order. One person might focus on an individual’s nose, while another the eyes, which can cause slight adjustments in the overall perception of the face. Therefore, it may be that doppelgangers could theoretically exist, but actually proving it is near impossible.