Noah talks with Jerry Spagnoli about the daguerreotype he took of the World Trade Towers collapsing. From his studio window, Spagnoli saw smoke coming from the World Trade Center and went to his roof to capture the image. A daguerreotype is a photographic image formed on a silver-coated copper plate. Daguerreotypes were used in the 19th century. The technology was first introduced in 1839. A photograph of Spagnoli's daguerreotype is published in this month's edition of DoubleTake magazine.