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Before the turn of the 20th century, the thought of airplanes—or any kind of aerial machine, for that matter—was purely science fiction. Fast forward to the 21st century, and drones have completely taken over the spotlight of the sky. The phrase “drone” — or “unmanned aerial vehicle” — is tossed around in news reports on a near-daily basis: Drone Strike Kills 6 in Pakistan; Amazon’s Drone Delivery: How Would it Work? At Mashable