Astronauts prepare for 3rd and final spacewalk

(AP) -- Shuttle Discovery's astronauts have one last spacewalk ahead of them.

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<p><a href="http://www.physorg.com/news157001483.html">Astronauts prepare for 3rd and final spacewalk</a></p> <p>(AP) -- Shuttle Discovery's astronauts have one last spacewalk ahead of them.</p>