Are All Mass Shooters Mentally Ill?

TECH SPACE HUMAN WORLD HISTORY ANIMALS EXPLORATION VIDEO View Online Are All Mass Shooters Mentally Ill? A link between disorders and violence isn't clear. READ MORE Why Cats Are Picky Eaters Cats have evolved to eat foods with a certain ratio of protein to fat. READ MORE WATCH VIDEO: Why Your Cute Cat Is Still A Vicious Killer  Your cat might not be fully domesticated, research suggests. AI-Made Sounds Are Real Enough To Trick Humans This computer is smart enough to supply audio for silent video clips. Welcome to the Turing Test for sound. READ MORE WATCH VIDEO: Why Do Animals Like Music? Certain animals seem to respond in a positive way to music, just like their human counterparts. How Are Suspected Terrorists Buying Guns? The gunman in the worst mass shooting in U.S. history was involved in multiple FBI investigations. So how did he buy guns with no red flags? WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2016 Discovery Communications, LLC