NASA weighs repair of jammed pin in third spacewalk

Discovery astronauts prepared for a third and final spacewalk Monday, with a busy to-do list that may include unsticking a jammed restraint pin used to clamp a toolbox to the outside of the International Space Station.

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<p><a href="http://www.physorg.com/news156957555.html">NASA weighs repair of jammed pin in third spacewalk</a></p> <p> Discovery astronauts prepared for a third and final spacewalk Monday, with a busy to-do list that may include unsticking a jammed restraint pin used to clamp a toolbox to the outside of the International Space Station.</p>