The Islamic State’s attacks in Europe earlier this year made headlines around the world. But there’s another terrorist group that by some estimates has killed more civilians over the past few years than ISIS. That’s Boko Haram in northern Nigeria, which killed more than 6,000 people last year. It’s a group known for tactics like using child suicide bombers, striking churches at Christmas and kidnapping schoolgirls, like the 276 taken from the town of Chibok in 2014. The violence has caused a