On Sept. 13, 48 hours after World Trade Center attack, a bomb scare at Grand Central Station panicked New Yorkers. Almost six weeks later, many people still seem panicked, living with anxiety, with dire predictions of coming attacks and with anthrax... (more) now a household word. Dr. Alan Louie, of Arthur D. Little Laboratories had been working on this anti-anthrax foam long before the attacks. 48 Hours'Susan Spencer reports on new efforts to counteract the threat. Two chemicals, mixed with water and used in a fire extinguisher, become an expanding foam that will stick to the walls and cover the floors, making sure that an entire area is safe again.