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"This is the first time any robot has drilled in any rock on Mars" or anywhere else beyond Earth, said Louise Jandura, chief engineer for Curiosity's sample system at the Jet Propulsion Laboratory in Pasadena, Calif.

WSJ: Rover on Mars Extracts First Rock-Core Sample

Simmons says it's already clear that people will spend more time with a robot that has this kind of natural response.

NPR: Robot Receptionist Dishes Directions and Attitude

As some background, NASA put a wheeled robot on Mars for the first time in July 1997.

FORBES: Checked Off The Bucket List: Landing On Mars