I've come to an industrial space in a tech-heavy area of San Francisco expecting to see a menacing humanoid robot solider doing something combat-like: the future of land-based warfare, perhaps. Instead, the black shiny faceless Phantom robot is engaged in "free play", manipulating a bunch of coloured kids blocks. "We need data from it just interacting with its environment…[and] this is today's menu," explains Sankaet Pathak, co-founder and CEO of two-year-old start-up Foundation Robotics, which