Startup Knightscope is preparing to roll out human-size robot patrols. As the sun set on a warm November afternoon, a quartet of five-foot-tall, 300-pound shiny white robots patrolled in front of Building 1 on Microsoft’s Silicon Valley campus. Looking like a crew of slick Daleks imbued with the grace of Fred Astaire, they whirred quietly across the concrete in different directions, stopping and t