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Jillian Peterson oversees the grimest Excel spreadsheet you can imagine. She's a

criminologist. Her database tries to make sense of mass shootings. It does

that column by column, breaking down a shooter's biography into neat piles.

There are the basics name age gender. But also what Jillian calls known

predictors of violence. So things like, did you have an interesting guns? What

was your family like growing up? How well did you do in school? Did you have a

job? Do you want to know how much a mass shooter weighed? How tall they are?

It's all here. Jillian's database will tell you that 30% of mass shooters had a

diagnosis of psychosis and then only four of them were women. Jillian visits

with shooters and their families too were lentlessly updating her work. She's

tracked every shooting of four or more people since 1966. It's now up to

Alaska. I want to say 189 different pieces of information. I thought of Jillian

in January after shooters struck twice in one week in California. I wanted her

...