I want to start with a story. A 16-year-old kid from Long Island walks onto the stage of America's Got Talent. He's nervous.You can see it. He opens his mouth and within seconds the entire audience is on their feet. The judge has turned and one of them hit the golden buzzer.What the audience did didn't know and what was this moment extraordinary is that 2 years earlier this kid couldn't see the stage he was standing on. Christian Guardino was born with a single error, not a trauma, not an accident, but one ...