They could be the earliest Christian writing in existence, surviving almost 2,000 years in a Jordanian cave. They could, just possibly, change our understanding of how Jesus was crucified and resurrected, and how Christianity was born. A group of 70 or so "books", each with between five and 15 lead leaves bound by lead rings, was apparently discovered in a remote arid valley in northern Jordan somewhere between 2005 and 2007. A flash flood had exposed two niches inside the cave, one of them marked with a menorah or candlestick, the ancient Jewish religious symbol. A Jordanian Bedouin opened these...