A series of drone sightings at London's Gatwick Airport caused over a hundred flights to be canceled or delayed as authorities struggled to respond to the potential danger.
A new analysis finds that the United States, Russia, and China are selling more weapons than ever, while India, China, and Saudi Arabia are top buyers.
Who can be targeted, what's the precise legal rationale behind strikes, does the U.S. compensate for civilian casualties, and other questions we still have about America's ongoing drone war.