NOVA: Spies That Fly
It has no pilot, no windows, but this odd-looking plane has already helped destroy nearly 750 enemy targets. It's the Predator, an unmanned aerial vehicle (UAV) equipped with surveillance cameras to spy on our enemies day or night. From spies the size of a CD player to fully armed pilotless jets, get a look at UAVs from the past 50 years, and at some revolutionary vehicles currently under development.