nvestors told Keller Cliffton his drone delivery ideas were “stupid” and even “illegal in the US.” So he built it in Rwanda, working from a cow farm, delivering blood to hospital rooftops at 2 AM. As of this week, Zipline operates the largest commercial autonomous system on Earth. Their drones have flown 130 million autonomous miles, with zero accidents, crashes, or fatalities. Sometimes the experts are wrong. Hear the whole story on today’s TWiST, recorded live at LaunchFest in SF. PLUS…