Don't lose the bag. You can bet that's what astronaut Heidemarie Stefanyshyn-Piper will be telling herself today on the second spacewalk of the current shuttle mission.
She and her crewmates will be making sure a bag of tools is tied down, so that it doesn't float away like another one did earlier this week. NASA puts its value at about $100,000.
Thursday's mission is almost identical to Wednesday's. It involves cleaning and lubricating a troublesome joint. The two astronauts will also relocate a railcar used on the space station's exterior rail track, and lubricate the end of the station's robotic arm.
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