including physicists stephen hawking and steve woz with knee yak issued a warning in a letter published today. they say autonomous weapons systems which use artificial intelligence to select targets without human intervention should be banned. predicting in the wrong hands, killer roboting could be used for assassinations and ethnic cleansing and would lead to a global arms race to rival the nuclear era. the u.s. military has invested heavily in the development of robotics for use on the battlefield. but mostly in a non-lethal capacity. this four-legged friend has been designed to help soldiers carry heavy gear across rough terrain. without the need for a driver. and this tiny machine can creep across enemy lines and is equipped with infrared cameras. lethal drones have been used for