Looking at them, you can see the similarities: the nose, the cheekbones, the dimpled chin and long, brown curls.
But what are the chances, right? What are the chances that two California teens would meet online in a roommate hunt, cross the country to attend Louisiana's Tulane University and learn a semester later they were half-sisters, the daughters of the same Colombian sperm donor?
Emily Nappi, 18, of San Francisco, and Mikayla Stern-Ellis, 19, of San Diego, learned exactly that January 7, when, acting on a suspicion they'd joked about since Father's Day, the women asked their mothers to hunt down their sperm donor numbers from the Los Angeles-based Calfornia Cryobank.
Stern-Ellis was in a doctor's office. She had asked her mother to send her the number. Nappi had done the same.
"They both text me at the same time, and it was the same number," Stern-Ellis said. "I was just staring at my phone. I didn't know what to do. I think the only way to describe it is mind-blowing."
Now that they know they're sisters, it all makes sense. They have the same build and are able to share clothes -- but, sadly, not shoes -- and they're science majors, with Stern-Ellis focusing on animals, Nappi on psychology.