Me again. I was thinking over the book again and I realized that there was one plot thread that surprised me: Much like the Saruman in the movie Return of the King (but not in the book), the story line about black 13 was left completely hanging. I know that it was in the World Trade Center, and thus lost in the rubble of the September 11 attacks, but what happened to it in the collapse of the tower? Was it possible to destroy it? If it was crushed to dust, was the dust hazardous? Did Jake tell Roland what he had done with it? If so, why didn't Roland advise the management of the Tet Corporation of the ball and its disposition?