The Remington 700 - Thousands of gun owners claim Remington 700 rifles have fired without the trigger being pulled. Now, with a class-action lawsuit and recall, why do most gun owners still have the controversial trigger?The North Korean Threat - Bill Whitaker reports from Seoul, where 28,000 U.S. troops are stationed in or nearby, and the Korean DMZ, seeing firsthand the tense standoff between the North and South.USA Gymnastics - Attorney suing USA Gymnastics for failing to protect female athletes believes every Olympic team since 1996 has had members abused by Dr. Lawrence Nassar.