Ask any farm kid from the last 50 years how much they liked rock picking and see their reaction. Most would say it was pretty fun for the first 15 minutes and miserable for the rest. Today, farmers can't afford to have sizeable rocks damage their increasingly expensive farm equipment in the fields. As with all aspects of agriculture, farms are looking to automation. Trevor Thompson, President of TerraClear Technologies, takes us through developing drone technologies that see rocks from the sky and machines that extract them from the ground with minimal disruption to the soil.