Engineers are designing robots that will kill on future battlefields without human intervention - and the ethics are being hotly debated. I've no idea why it would be more ethically correct to be killed by an m4 in a firefight than a MQ-9 Reaper - but I guess that makes good discussion. Who knows maybe we'll get super civilized in 1000 years and settle our differences with Government Sponsor Halo battles.

"Every so often in history, you get a technology that comes along that's a game changer," he says. "They're things like gunpowder, they're things like the machine gun, the atomic bomb, the computer… and robotics is one of those."

"When we say it can be a game changer", he says, "it means that it affects everything from the tactics that people use on the ground, to the doctrine, how we organise our forces, to bigger questions of politics, law, ethics, when and where we go to war."

 BBC News - Robot warriors: Lethal machines coming of age