Last year Luke Geissbühler and his son, who live in Brooklyn, popped a high-definition video camera and an Apple iPhone into a sturdy protective box with a hole for a camera’s lens. They attached the box to a weather balloon, which they released about 50 miles outside New York City. The balloon soared into a stratosphere and eventually burst. A parachute brought it to the ground. By tracking the iPhone’s inbuilt global positioning system, the Geissbühlers were able to retrieve the box and the video [top] of their ‘mission,’ which shows the curvature of the planet clearly.

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