here's jim axelrod ♪ ♪ >> reporter: listen to emma yang play the piano.surprise she played carnegie hall three times before she was in high school. but her piano skills may take a backseat to her computer skills. >> i started coding when i was around six years old. >> reporter: when you were six. >> yes. >> reporter: you started coding. >> yes. >> reporter: four years later, emma's beloved grandmother, who lived in hong kong, started developing alzheimer's. >> so when i'm on the phone with her, sometimes she's going to ask me the same question over and over again, like, "how are you eating? how are you? and how are you" again. >> reporter: with her ability to code, a.m. had the deal set to deal. >> actually, one of the things i love about app developing and coding is it's really empowered me to do something to help her. even if she is still declining, she can actually still stay connected with me. >> reporter: emma developed "the times," an app using facial recognition technology to remind people with alzheimer's who they're talking to or looking at when