Medical advances have given doctors the power to do many things. They can transplant organs, separate conjoined twins, and bring people back from the brink of death. But the one thing they still can't do is make blood. That takes a regular person, willing to donate. But so many tri-staters don't. It may be they've never seen where their blood goes after it leaves their bedside. In this family first, meet a four year old girl who knows. She's been on the receiving end of hundreds of donations from perfect strangers.