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'Space Men:' Ascending to Earth's Deadliest Frontier

In a new PBS documentary, the pioneers of high-altitude exploration are celebrated as the trailblazers before human spaceflight was possible.

February 25, 2016
12:28 PM EST
Joseph Kittinger sits in the gondola before rising to the stratosphere during Project Manhigh. June 1957. | Courtesy of Joseph Kittinger