Next week marks the 67th anniversary of D-Day, when the Allies stormed the beaches at Normandy, France, and changed the face of World War II. Not much evidence of the war remains in Normandy: a few dilapidated relics, a cemetery, a war memorial. But something else was left behind that cannot be seen by the naked eye: shrapnel and iron and glass beads left over from the D-Day invasions in 1944.