Rather than specifically triggering the toxic effects of organisms such as anthrax, the Sunshine project warned that weapons based on a new medical technique called RNA interference could shut down vital genes. If the sequence of the target gene varies between two different populations the technique could be used to interrupt key body functions in one population and not the other. "If as little as 10% or 20% of a target population would be affected, this would wreak havoc among enemy soldiers on a battlefield or in an enemy society as a whole," the group said. Others say the concerns...