"Autonomous weapons systems."
Even the phrase is scary: guns and bombs that operate on their own, making their own kill decisions.
As of now, these systems are still hypothetical. But, the US military and the UN are confronting the ethical questions surrounding this technological innovation before actual deployment of the hardware.
That's a first. The follow-up conference will meet in November, 2014. Expect plenty of marchers, 'cause even the thought of these things is terrifying.