Robot works at grocery store in Pennsylvania

A robot named Marty cleans the floors at a Giant grocery store in Harrisburg, Pa., Tuesday, January 15, 2019. On Monday, the Carlisle-based Giant Food Stores announced new robotic assistants will be arriving at all 172 Giant stores by the middle of this year. The chain's parent company says it plans to eventually deploy the robots to nearly 500 stores. [Photo: AP/Matt Rourke]