Missouri's New Gun Law – Missouri's new Second Amendment Preservation Act, meant to protect the rights of gun owners, is impeding the fight against violent crime, local law enforcement officials say. Norah O'Donnell reports. The Longest-Running Oil Spill – Jon Wertheim reports how the U.S. Coast Guard, with help from a Louisiana engineering firm, contained the longest-running oil spill in U.S. history, despite legal pushbacks from the oil rigs' owner. Carnegie Heroes – They are people rewarded for heroic, life-saving acts done despite the danger to themselves, by a 117-year-old foundation endowed by the steel magnate Andrew Carnegie. But are heroes made or born? Scott Pelley reports.