- “Lettuce Bot” Rolls Through Crops, Terminates Weeds It Visually Identifies http://singularityhub.com/2012/09/19/lettuce-bot-rolls-through-crops-terminates-weeds-it-visually-identifies/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+SingularityHub+%28Singularity+Hub%29&utm_content=Google+International 8 comments robotics