Your life in your phone's hands: can an app really detect cancer?

In a video, 30-year-old Stacey Everson tells the story of how she picked up her phone, snapped a selfie, and saved her own life. She might have easily overlooked the small, irregular mole on her upper left arm. But prompted by friends and family, she took a picture of the growth with an app named SkinVision, and followed up on the app's recommendation that she see a doctor, urgently. The doctor removed and tested the growth. "A week later, it came back positive for early-stage melanoma," she says.