On Dec. 14, 2012, Adam Lanza shot and killed 26 people including 20 children at Sandy Hook Elementary, in Connecticut.
The tragedy refueled the ongoing debate about gun control and gun rights in the United States: What kinds of guns should be illegal? Should any? What kinds of people should not have access to guns? Should felons or those convicted of drug- or domestic abuse-related crimes be barred? What should be required to purchase a gun?
Not a single major piece of gun-related legislation has been passed at the national level since Sandy Hook.
There have been 44 school shootings.
A report issued earlier this month by the advocacy groups Mayors Against Illegal Guns and Moms Demand Action explains that number: "Incidents were classified as school shootings when a firearm was discharged inside a school building or on school or campus grounds, as documented in publicly reported news accounts."
Twenty eight people died in these shootings: 19 homicides and nine suicides. The youngest shooter was 5; the oldest, 53. "Among those shootings where it was possible to determine the source of the firearm, three-quarters of the shooters obtained their guns from home," according to the report.
More than half of the 44 shootings, 23, occurred in Southern states including three in Georgia.
From the report again: "In the first six weeks of 2014 alone, there were 13 school shootings including one eight-day period in which there were four shootings in K-12 schools."