TV host Samantha Harris says she will have a double mastectomy after being diagnosed with breast cancer. But the surgery doesn't eliminate cancer risk. Jordan Strauss/Invision/AP hide caption

itoggle caption Jordan Strauss/Invision/AP

I'm not trying to lead you astray. It's just that scientists are not skeptical enough about their mouse studies. iStockphoto hide caption

itoggle caption iStockphoto

Garrett shares a moment with his mother, Natalie Peterson. "He has been doing so good," she says. "He's been smiling." Nicole Haley/University of Michigan Health System hide caption

itoggle caption Nicole Haley/University of Michigan Health System

Virginia Rady, 28, holds her old nebulizer at her home in Dallas. Rady was diagnosed with chronic persistent asthma at age 2. She underwent a series of three outpatient surgeries between December 2012 and February 2013 for a procedure known as bronchial thermoplasty. She says the procedure has changed her life, allowing her to remove her nebulizer from her bedside. Brandon Thibodeaux for NPR hide caption

itoggle caption Brandon Thibodeaux for NPR

Alice Snyder, with her parents Mary and Ryan, during a checkup with Dr. John Herzenberg, who treated her clubfoot without surgery. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News