A bright yellow machine resembling a cross between a vacuum cleaner and a small scooter scrapes a narrow village road in Cyprus, working to solve a painful mystery from the the divided island nation's conflict-ridden past. It uses radio waves to detect any disturbances in the layers of soil under the asphalt — potential evidence that could support eyewitness accounts of a mass grave containing remains of people who vanished nearly a half-century ago. Cyprus' Committee on Missing Persons is testing the pulseEkko — a deep ground penetrating radar — to help locate the remains of hundreds of Greek Cypriots...