Effective injury control requires accurate information. For injuries caused by firearms, that information includes not only an understanding of the research and policy literature, but also a basic knowledge of how firearms work. This is particularly true for interventions that focus on the product—the firearm—rather than on changing the behavior of victims or perpetrators of violence. But some injury control researchers and advocates did not grow up in a household where firearms were present, and have been forced to learn how guns work, if at all, in a piecemeal fashion from sources not designed for a public health audience. With Reducing Firearm Injury and Death: A Public Health Sourcebook on Guns, authors Trudy A Karlson and Stephen W Hargarten remedy this gap in the …