Religious relics, defined as "either portions of or objects connected with the body of a saint or other holy person," are among the most revered items in the world. Christian relics such as the Holy Grail, the True Cross, and the Lance of Longinus are also the source of limitless controversy. Such items have incited people to bloodshed and, some say, have been a source of miracles. Relics inspire fear and hope among the faithful and yet are a perennial...