Latin America may be the most murderous continent on Earth, but huge improvements in public safety have been achieved in several major cities, according to a new homicide map of the world that is being launched this week. Several metropolises that were once bywords for violent death – such as Medellín, Bogotá, São Paulo and Rio de Janeiro - have seen murder rate declines of more than 60% over the past two decades thanks to improved living standards, better... (GunPolicy.org)