What happens to the Islamic State if it loses the battle for territory in Iraq and Syria? Here's a list of ways it might go down.
A young boy is strapped with explosives and sent to detonate himself and those around him at a school. An expert on terrorism explains how and why children become embroiled in militant conflicts.
Profit estimates have ranged from $4 million to $7 billion. But with the Paris attacks costing only $10,000, does a number even matter?
The final article of our series on the historical roots of Islamic State examines the role recent Western intervention in the Middle East played in the group's inexorable rise.