Listen now (80 min) | This is the web version of Foreign Exchanges, but did you know you can get it delivered right to your inbox? Sign up today: Returning guest and scholar of the Sahel Alex Thurston joins me to discuss the recently reported death of al-Qaeda in the Islamic Maghreb leader Abdelmalek Droukdel. Serendipitously, this subject coincides with Alex's forthcoming (probably in September) book,