Something good has come out from under the World Trade Center. Near the site of so many grim finds, excavators working on the new trade center unearthed a treasure — an ancient wooden ship buried beneath modern lower Manhattan. Its remains were discovered about 20 feet under street level, in an area that had not been dug out for the original World Trade Center. This old ship has tales to tell. But before it can give up any of its secrets, it must be preserved. And fast, because...