In a race to achieve the first privately funded manned spaceflight, two teams of rocket engineers are poised to compete for the $10 million X-Prize by launching people to the edge of space and bringing them back safely twice within a two-week period.
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The teams are Scaled Composites, led by aviation maverick Burt Rutan, and Armadillo Aerospace, a Dallas group headed by John Carmack, a computer game designer who made a fortune on "Doom" and "Quake."
