Tim Harford and the More or Less team try to make sense of the statistics which surround us. From BBC Radio 4
http://www.bbc.co.uk/programmes/p02nrss1
WSMoreOrLess: Counting Foreign Fighters
It has been reported that as many as 20,000 foreign fighters have joined militants in the Middle East and that they make up around 10% of ISIS. Wesley Stephenson and Federica Cocco look at the numbers behind those claims and examine where those fighting in places like Syria and Iraq come from.