Spitting across the demarcation line that separates the two armies. Making throat-slashing hand gestures. Flashing their middle fingers. Trying to talk to the South Korean troops. North Korean troops in the Demilitarized Zone dividing the two Koreas have been more boldly trying to provoke guards on the other side since the North claimed to have detonated a nuclear bomb Monday, a U.S. military spokesman said. Full Story