Saudi Arabia is building great wall — or rather, a great chainlink fence with razor wire — to "protect against ISIS" in Iraq. And it's not the only country investing in very expensive walls right now, even though they probably won't work. Why? Because walls aren't just about security. They're also powerful symbols.
Say hello to the K5 Autonomous Data Machine, a mobile surveillance robot that could soon be prowling malls, schools, and corporation foyers near you. Privacy groups are calling the California-built robot "R2-D2's evil twin."