Canada's Prime Minister Justin Trudeau, with government officials and gun control advocates, speaks at a news conference on May 30 about firearm-control legislation that was tabled in the House of Commons in Ottawa, Ontario, Canada. Blair Gable/Reuters hide caption
Colombian sculptor Doris Salcedo (center) cleans a spill on the floor during the pre-inauguration of her peace monument titled Fragmentos (Fragments), for which she used metal melted-down from the weapons handed over by FARC guerrilla fighters to make the floor, in Bogotá on July 31. Diana Sanchez/AFP/Getty Images hide caption
The U.S. Army's Autonomous Remote Engagement System is mounted on the Picatinny Lightweight Remote Weapon System and coupled with an M240B machine gun. It's part of a program that reduces the time to identify targets using automatic target detection and user-specified target selection. U.S. Army hide caption
A report from the RAND Corporation confirms there is very little scientific evidence for or against many gun policies. RAND hopes to lend researchers a hand with its new state-by-state database of gun laws. Anadolu Agency/Getty Images hide caption
Coalition forces fire a Carl Gustaf recoilless rifle during a training exercise in Afghanistan's Helmand province in 2013. Spc. Justin Young/U.S. Department of Defense/DVIDS hide caption
Residents leave their houses in Thessaloniki, Greece, on Sunday as part of a mandatory evacuation. It preceded an operation to defuse a World War II bomb discovered there. Sakis Mitrolidis/AFP/Getty Images hide caption
The robotic skull of a T-600 cyborg used in the movie Terminator 3. Eduardo Parra/Getty Images hide caption
A woman with a cut on her cheek and trouble seeing with her left eye was admitted to Craig Joint Theater Hospital at Bagram Air Field, Afghanistan. X-rays showed a projectile that surgeons decided to remove. Forbes et al. 2016/Journal of Neurosurgery hide caption
The "No More Weapons" billboard is installed in Ciudad Juárez in 2012. Raymundo Ruiz/AP hide caption
Peter Thum visited a military base in Rwanda where destruction of small arms took place in 2009. Moises Saman/Courtesy of Fonderie 47 hide caption
Germany is the world's third-largest exporter of arms, like this bazooka destined for northern Iraq, being packed up at a German military base on Thursday. The country's economy minister has held up hundreds of weapons exports since he took office in December, angering many in the defense industry. Carsten Koall/Getty Images hide caption
Mikhail Kalashnikov, with his AK-47, in 2002. Jens Meyer/ASSOCIATED PRESS hide caption