By Rebecca Peters for The Guardian - The mass murder in Newtown Connecticut a year ago caused shock and sorrow all around the world. In Australia it also revived memories of our own horror on a similar scale, when dozens of people innocently going about their day were gunned down by a disturbed young man. Our tragedy occurred in 1996 at the Port Arthur historic site in Tasmania, one of Australia's most popular tourist destinations. The dead numbered 35, with more than 20 others injured. The victims ranged in age from 3 to 72. They included children, teens, adults and seniors; tourists and local workers; several couples, a pair of brothers, a mother and her two little daughters, and members of a retirees' club on an outing. This was not the first shooting massacre we had suffered, but it was the largest in living memory. The tragedy ignited an explosion of public outrage, soul-searching and demands for better regulation of guns. We changed our laws. As a result, gun deaths in Australia have dropped by two-thirds, and we have never had another mass shooting. Every country is unique, but Australia is more similar to the US than is, say, Japan or England. We have a frontier history and a strong gun culture. Each state and territory has its own gun laws, and in 1996 these varied widely between the jurisdictions.