Robots will hit the streets to deliver your groceries this fall in Washington, D.C.

The first autonomous robots to deliver packages straight to your front door won't be flying -- they'll be rolling around on six wheels. Starship Technologies, an Estonia-based startup created by two Skype co-founders, Janus Friis and Ahti Heinla, is slated to begin testing its autonomous delivery robot to bring groceries and restaurant takeout to Washington, D.C., homes and businesses this fall. It's the first U.S. municipality to approve ground-based robots to roll around on city sidewalks. Starship hopes to solve the "last mile" problem –– the work of getting packages from the fulfillment center directly to people's homes -- currently done by humans. It's a problem Amazon wants to solve with drones, but the FAA's rules bar drones from flying around humans without an operator in line of sight.