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Spacewalkers replace broken hand on robot arm

A pair of NASA spacewalkers replaced a faulty gripper on the end of the International Space Station’s Canadian-built robotic arm today during an outing that lasted nearly seven hours.

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By Alan Boyle

Mastermind of Cosmic Log, contributing editor at GeekWire, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.

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