Does the Virginia Tech massacre affect your view of the efficacy of an assault-weapons ban? In 2007, Seung-Hui Cho perpetrated the deadliest shooting in the country’s history. He killed 32 people using two semiautomatic handguns.

Why has violent crime declined in the United States during the past 20 years even as gun ownership has ticked up? According to Gallup, nearly half of adults have a gun on their property, the highest number since 1993. Why has crime declined even as gun-control laws have been liberalized?

The assault-weapons ban passed in 1994 and was in effect for ten years. The paradigmatic school shooting took place at Columbine High School in 1999. Why didn’t the assault-weapons ban prevent it?

There have been hundreds of murders with guns this year in Chicago, where gun laws are restrictive. What new gun laws does the city need to stop the tide of mayhem?