While the country is reeling from the terrorist attacks last week, a new center has begun to train volunteers for a horror much greater - bioterrorism. "The events that took place on Tuesday, although they were terrible, didn't involve some of the more feared weapons of mass destruction," said Ed Caldwell, training supervisor for the Clara Barton Center for Domestic Preparedness. "What happened (in New York City) pales in comparison with what someone might accomplish with a bioterrorism act."