More than 60 years had passed before I found them. Dozens and dozens of letters written to my family during WWII- from total strangers- to tell my great-grandmother that her son had been captured and was being held as a POW. How did they know this? Well, it seems the short-wave radio had held all the answers. POWs were allowed to state their names and hometowns on the radio, and sometimes relay a short message to their families. Scores of Americans, listening to the German propaganda from so far away, heard my grandfather's information, and took it upon themselves to write to my...