YOYO means "You're On Your Own." I saw an interview with author Katherine Schweit and have a copy of an FBI study she contributed to: A Study of Active Shooter Incidents in the Unites States Between 2000 and 2013. There is a lot to unpack in "Stop the Killing: How to End the Mass Shooting Crisis." I enthusiastically recommend adding a copy of "Stop the Killing" to your library.My study of "mass shootings" began in the spring of 1974 with a 1973 book by Robert Sherrill: "The Saturday Night Special." I enlisted in the Marines that fall, spent 27 years in the military before being retired (half on active duty including a year in a combat zone) and with some overlap I was a contract security officer for more than 30 years. During that time, I used what I had learned to fight monsters. Fortunately, I did not become a monster myself. Most of my information came from open sources. News is rumor, gossip, myth and lies.The cover art seems to be falling .30/30 Winchester cartridge casings--the focus is too soft to read the headstamps. That cartridge's claim to fame is being America's first hunting cartridge that used smokeless propellant powder and the .30/30 hit the market in the year 1895. Why wasn't another cartridge used? On Page 149 Mrs. Schweit says that 2/3rds of the firearms used in 118 shootings (killing four or more people each) over the past 28 years were handguns. I admit that the cover art didn't factor in my decision to buy "Stop the Killing."Page 8 had sound advice: "Stop looking for a single answer." This book is indexed, has a table of contents, five charts, and contains much information on mass shootings in shopping malls, schools, hospitals, government buildings, workplaces, and open areas in public. Mentioned is mass shootings that take place in private homes. "Stop the Killing" is worth the money--and worth the time to read the book.