Florida has its oranges, Georgia has its peaches, and California has its lettuce. These leafy greens are the Golden State's biggest vegetable crop, bringing in $1.6 billion annually. Problem is, they require a lot of attention to raise properly. Historically, California has relied of its abundant, affordable work force. But with that labor pool shrinking and foreign competition increasing, lettuce farmers in America's Salad Bowl are facing rising labor costs and worker shortages. And that's where the fully automated Lettuce Bot comes in.