Meet the Tugs - a team of 27 robots now zooming around the hallways of the recent University of California,San Francisco hospital at Mission Bay. They observe a bit like R2D2, dragging a platform around behind them. Instead of drones, or think of them more as miniature flatbed trucks,ferrying carts of stuff around the vast hospital complex - food, linens, or medications,medical waste and rubbish. And they do it more efficiently than humans.
Source: phys.org