Keenan Wyrobek is the co-founder of Zipline. His problem: How do you fill the skies with delivery drones and keep them from crashing into each other?

Zipline’s drones already make hundreds of deliveries a day in Ghana and Rwanda. But to expand to the U.S. he has to solve a fundamental problem. Americans’ love of freedom and the open skies makes it hard to build a drone business here.

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