J. Richard "Dick" Steffy stood inside the limestone hall of the Crusader castle in Cyprus and looked at the wood fragments arrayed before him. They were old beyond belief. For more than two millennia they had remained on the sea floor, eaten by worms and soaking up seawater until they had the consistency of wet cardboard. There were some 6,000 pieces in all, and Steffy's job was to put them all back together in their original shape like some massive, ancient jigsaw puzzle. He had volunteered for the job even though he had no qualifications for it. For twenty-five years he'd been an...