What if we looked at gun-related violence purely as a public health issue? That's what Harvard's David Hemenway did in his book Private Guns, Public Health. As best he could, Hemenway removed emotion from the arguments about firearms, and collected the best data available. In the wake of last week's mass shooting in Rochester, some of our listeners have asked questions about firearm statistics. Hemenway joins us for the hour to answer our questions.