What's that in the sky? Is it a big bird? No, it's a drone Since the 1990s drone development and use worldwide has skyrocketed. The MQ-9 Reaper and other military drones spy on and attack enemy targets. Hobbyists build recreational drones, and farmers use drones to check their crops. Young readers will learn how unmanned aerial vehicles work, the laws governing them, and why these robots continue to fascinate us.