In what is probably the largest simultaneous attack ever, over 100 bombs went off in Kano, the next-largest city of Nigeria, which according to the BBC as of this post killed ~150 people. Boko Haram, the Islamic group who've attacked Nigeria intermittently over the past few years, have continuously called on Christians to leave North Nigeria. This is, undoubtedly, an incredible crisis for Nigeria, and gives a glimpse into a country that is, essentially, cobbled together by former British colonies from dozens of otherwise disparate tribes.