Mass shootings like the one at a GOP baseball game are more common in the US than in other industrialized nations. And they are getting more frequent and more deadly.
American attitudes toward smart guns are complex and do not necessarily follow the patterns we might expect.
The candidate endorsed by the NRA this year wasn't always so pro-gun. A sociologist and physician explains how Trump's position on guns could play out if he were to win in November.
Thanks to a funding ban passed two years ago, the CDC and other federal groups that study health have been avoiding gun violence research.
Research on background checks for gun purchases suggests there is an increase in gun acquisition a few months after a mass shooting happens.
Other 'advanced nations' make it far harder for someone like the Charleston killer to get his hands on a Glock semiautomatic handgun or any other kind of firearm.