RUSH: Have you heard about what went on at the University of Missouri-Rolla? ?Nearly two dozen people were being decontaminated yesterday after a white powdery substance was found on a student who claimed to have a bomb and threatened ?terrorist-type’ actions. The man, described as an ?international graduate student,? was depressed about his grades, according to police. School officials said possible bomb materials were found when he was taken into custody. Twenty-three people were sent through a decontamination process Tuesday morning outside the University’s civil engineering building where a police standoff with the student had started around 2:30. Acting police chief Mark Kearse said when the cops arrived the student was holding a knife and that he held up a bag and said ?this is a bomb.? He also claimed to have anthrax. Mayor William Jenks said the student?s identity and nationality were not released had problems and was depressed.? We have an