As part of my day-to-day job, I read a lot of news reports, books and scholarly studies. Though the never-ending avalanche of information sometimes feels like a mild version of electronic waterboarding, it also allows me to pick out interesting parallels between different events. Not long ago I re-read Blood and Rage, an excellent book by historian Michael Burleigh that outlines the cultural history of terrorism. As I flipped through the chapters on nihilist and anarchist terrorism in the late 19th and early 20th centuries, I couldn't help but notice some intriguing similarities to jihadism. This week I'll share them with you to put the modern threat that jihadists pose into better context....