https://www.theguardian.com/environment/2021/apr/29/killer-farm-robot-dispatches-weeds-with-electric-bolts > Makers say machine could be part of an agricultural revolution of automation and sustainability > In a sunny field in Hampshire, a killer robot is on the prowl. Once its artificial intelligence engine has locked on to its target, a black electrode descends and delivers an 8,000-volt blast. A crackle, a puff of smoke, and the target is dead – a weed, boiled alive from the inside.