"No weapons system is foolproof. We'll always have one or two that go off target." Did you know that unmanned spy planes can detect and track targets, and send data back to battle command as soon as it's gathered? That soldiers of the future may wear an exoskeleton powered by mechanical muscles? So, what does all this mean for the waging of war? Science at the Edge focuses on the developments and theories in science that are giving rise to controversy...