Article Photos: Robots to revolutionize farming, ease labor woes 1/3

In this May 23, 2013, photo, Jorge Heraud, CEO of Blue River Technology, center, explains how the lettuce bot works as software engineer Willy Pell, in green, watches in Salinas, Calif. In the Salinas Valley, the lettuce capital of the world, entrepreneurs with the Silicon Valley company Blue River Technology are testing the Lettuce Bot, a boxy robotic machine that can thin fields of lettuce, a job that now requires detailed hand work by 20 farm workers. (AP Photo/Marcio Jose Sanchez)