Farming has always been a difficult industry requiring hours of backbreaking labor with success often determined by the weather. An early frost, an unanticipated hailstorm, drought; they are all examples of the risks that farmers and their corporate cousins face year after year. While the weather will remain troublesome, farmers are seeing technology changing how they work. Robots are beginning to work the fields, plowing, planting, weeding, and harvesting. Their development promises more efficient use of seed and fertilizer, reducing costs and eventually lessening drainage of nitrogen and other pollutants into rivers and streams. See what you know about agricultural robots.