Inside the delicate art of maintaining America’s aging nuclear weapons

KANSAS CITY NATIONAL SECURITY CAMPUS, Mo. (AP) — In an ultra-sterile room at a secure factory in Kansas City, U.S. government technicians refurbish the nation's nuclear warheads. The job is exacting: Each warhead has thousands of springs, gears and copper contacts that must work in conjunction to set off a nuclear explosion. Eight hundred miles away in New Mexico, workers in a steel-walled vault have an equally delicate task. Wearing radiation monitors, safety goggles and seven layers of gloves, they practice shaping new warhead plutonium cores — by hand. And at nuclear weapons bases across the country, troops as young…