If you took a look at newer Roombas and wondered why that clever mapping couldn't be used to cut your lawn... well, you're not alone. iRobot has unveiled the Terra, a robotic lawn mower that uses the company's mapping tech to trim your grass with minimal fuss. Instead of marking your lawn area with boundary wires as you do with many existing robomowers, you place wireless beacons (shown below) and drive the bot once around the perimeter. After that, it's largely hands-off. Like a Roomba, the Terra will automatically make the rounds and return to a charging base whenever it's low on power.