NORMAN, Okla. -- The general manager of a Norman feed store said Tuesday that Joel Henry Hinrichs III had inquired about purchasing a significant amount of ammonium nitrate, the primary ingredient used in the 1995 Oklahoma City bombing. Dustin Ellison, the general manager of Ellison Feed & Seed on Porter Avenue, said that a man matching Hinrichs' description had come into the store days before he blew himself up on OU's campus. Ellison said the man asked about ammonium nitrate, but couldn't offer a reason why he needed it. After the bombing, Ellison said he thought nothing of it. However,...