Mark Rober tells a good story.
1:40 "how clever people are using engineering to change the world"
1:26 cool asymmetric propeller design is super quiet. 8:37 the advent of fixed-wing Zipline drones that travel 70 miles in Rwanda has slashed maternal mortality by 88%. Incredible.
11:46 the cover story - delivery drones that stay afloat at 400' and precision-drop cargo by a tether line.
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