Gun deaths dropped in Australia following a massive buyback program and tighter gun laws, according to a new study published Wednesday. However, the scientists say they can't decisively prove a connection. Researchers from the University of Sydney compared firearm deaths both before and after the 1996 Port Arthur Massacre, when a gunman killed 35 people and wounded 23 others. That mass shooting prompted Australian legislators to take action, launching a firearm buyback... (GunPolicy.org)