On a bluff south of San Francisco overlooking the Pacific Ocean, an electric motor whips a drone built by startup Zipline off a catapult launch ramp beside me and into the air on a test flight. The aircraft, with a fixed-wing design resembling that of a conventional airplane, pilots itself north, plans its approach based on the wind direction, makes a sweeping turn and drops a box of Band-Aids, Advil and Tums by parachute onto the grass a few yards in front of me. .
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