Syed Farook and Tashfeen Malik, suspected of murdering 14 people this week in California, are just one of several couples who have been linked to multiple killings.
At least 18 people were killed in a series of gun attacks across Paris on Friday, as well as explosions outside the national stadium where France was hosting Germany.
Is college becoming obsolete? Not necessarily -- or at least not yet.
As another mass shooting captures headlines, Seeker Daily examines the current state of gun purchasing in America. Are background checks enough? Can would-be criminals every really be stopped from acquiring a gun?
As shootings become more common, the public's reaction dims, researchers say.
No geographical pattern emerges for the violence, but plot points underscore scope of the problem.
How could such a tragedy be dismissed by conspiracy?
The shooting of high school students in Ohio today resulted in one dead and the gunman arrested. Why did he do it?