A look at sidewalk delivery robots serving students across US college campuses, an ideal proving ground with pedestrian-friendly designs and eager consumer base (Kyle Stock/Bloomberg)

Kyle Stock / Bloomberg:
A look at sidewalk delivery robots serving students across US college campuses, an ideal proving ground with pedestrian-friendly designs and eager consumer base  —  Robot 509 from Starship Technologies is both patient and skittish.  The autonomous machine, which resembles a Yeti cooler crossed …