By Petula Dvorak, (c) 2017, The Washington PostAt 39, Melany Knott didn't have a passport. She'd never flown on a plane. She was too busy caring for four kids, three cows, hogs, horses and dozens of chickens in rural Taylorsville, Maryland. That was in January. In August, she tells me all this at Reagan National Airport, as she and her terminally ill daughter head to their apartment in Mexico and another round of experimental treatment at a hospital in Monterrey, a city in the foothills of the Sierra Madre Oriental mountains.Read more on NewsOK.com