Drone racing is a high-speed sport demanding instinctive reflexes -- but humans won't be the only competitors for long. Researchers at NASA's Jet Propulsion Laboratory in Pasadena, California, put their work to the test recently. Timing laps through a twisting obstacle course, they raced drones controlled by artificial intelligence (A.I.) against a professional human pilot. The race, held on Oct. 12, capped off two years of research into drone autonomy funded by Google. The c