Mass Shootings by the Numbers: There have been 41 mass shootings in the last 15 years and 10 over the last 19 months. These Infographics and maps show the data about where the the shootings took place and the demographics of the perpetrators. It looks like Colorado, Louisiana, and Alabama had the highest death by firearm rates. Of the 41 mass shootings, the perpetrator committed suicide in 23. The shooter is most likely to be a male between 20 and 40 with some form of mental illness and use a handgun during the attack. The event is most likely to occur at a school or a workplace. With this last piece of information in mind, if you didn’t read How To Survive A Shooting At Your Office: Run. Hide. Fight yesterday and watch the six-minute video, it may be worthwhile to do so. I’m not sure what explains the recent increase in frequency of these atrocities, but this should be a question at the forefront of current behavioral research.