These 7 robotic delivery companies are racing to bring shopping to your door

By 2020, people thought the autonomous car would whisk you to the office while you read the paper and tackle your emails, then taking you home from the bar on a Friday evening. That remains lodged somewhere in the pipeline for now. But another slice of science fiction is on the way – robots that deliver your food -- and it's already knocking at the door. Robotic food delivery (or, increasingly, the delivery of anything that fits into a robot) is being tackled by a wide range of companies, from garage startups to retail giants. Many use six-wheeled robots designed to drive themselves along the sidewalk and the pathways of business parks and college campuses.