This Sunday marks the 17th anniversary of the Port Arthur massacre in Tasmania, where 35 people were killed and 18 wounded by a lone gunman brandishing high-powered longarms. In response to the killings, Australia's gun laws were significantly tightened. The prime minister at the time, John Howard, was able to gain bipartisan support from all state governments for a 10-point plan to regulate firearms - known as the 1996 Nationwide Agreement on Firearms. This agreement... (GunPolicy.org)