Yet again this week, our nation confronts the tragedy of a mass shooting. Nineteen-year-old Nikolas Cruz has been charged with 17 counts of murder following an attack on Wednesday at Marjory Stoneman Douglas High School in Florida. Cruz was a student at the school but had been expelled. For perspective on where this incident falls among the more than 40 active shooter episodes at schools in the United States since 2000, 12 people were killed at Columbine and 26 were killed at Sandy Hook; two were killed last month in Kentucky. Three of the 10 deadliest mass shootings in modern United States history have occurred in the last five months. Keep reading for more news.