An internal short circuit was the culprit that sidelined NASA's Mars rover Curiosity for six days, but it isn't expected to cause any more problems, say officials at the Jet Propulsion Laboratory in Pasadena, Calif. "We made a list of potential causes, and then determined which we could cross off, one by one," said Rob Zimmerman, the rover's electrical engineer. Curiosity went back to work Saturday delivering powdered rock to an internal laboratory, with its voltage level and robotic arm back to normal operations.

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