A pioneering United Nations treaty aimed at regulating the global trade in conventional weapons surpassed a symbolically important threshold on Wednesday when 18 countries, most notably the United States, officially signed the document, pushing the total number to more than half of the organization's member states. Proponents of the treaty, which was adopted overwhelmingly by the 193-member General Assembly in April, but still required signing and ratification, said... (GunPolicy.org)