Watch “Gabby Giffords Won’t Back Down” at 9 p.m. ET/PT November 20 on CNN. Doctors and public health experts often talk about a bullet as the vector, just as a virus is the vector of ...

(CNN) — When American golfer Gary Woodland won the US Open tournament ... he sat down to write some letters to his wife, Gabby, and three young children. “It was brutal. I reached out to ...