Relatives and friends of Eduardo Felipe Santos Victor, a teenager who was shot dead in Morro da Providencia, a low-income favela community, mourn during his funeral in Rio de Janeiro, on Sept. 30, 2015.
Susan Nelson, author and public speaker on brain injury awareness and gun safety, at her home in Austin, Texas. Nelson survived a point-blank gunshot to the head in 1993.
Gabriel C. Perez/KUT
A student stops to look at a memorial at Marjory Stoneman Douglas High School in Parkland, Fla., on Feb. 28. Last month's shooting raised questions about whether states are doing enough to fund mental health services in schools.
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Jordan Riger, 22, uses her laptop to track attendance for a weekly meeting of Students for the Second Amendment at the University of Delaware in Newark, Del. She sees firearms as tools for self-defense.
Hansi Lo Wang/NPR
A billboard advertising a gun tourism business in Las Vegas hovers above the Mandalay Bay Hotel, site of a mass shooting Sunday night that killed 58 people and injured nearly 500.
Donald Carder wears his handgun in a holster as he pushes his son, Waylon, in a stroller at the National Rifle Association convention in Louisville, Ky., in May. Attendees at the convention are permitted to carry firearms under Kentucky's open-carry law.
Gov. Nathan Deal says that a bill making it legal to carry guns in most buildings and areas at public colleges is too broad. He's seen here at the end of the General Assembly's session in March.
West Virginia's House of Delegates has approved a bill repealing permit requirements for carrying a concealed gun. Pictured here is a display of pistols at a gun shop in 2013.