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Spacewalkers put new hand on robot arm

NASA astronauts Mark Vande Hei and Scott Tingle spent nearly seven and a half hours on a spacewalk outside the International Space Station to install a new “hand” on the station’s robotic arm.

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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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