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'Chalkbot' tweets the streets of the Tour de France

Eric Gaillard/Reuters

(Read caption) Team Astana riders Lance Armstrong (l.) and Andreas Kloden ride in the 10th stage of the 2009 Tour de France between Limoges and Issoudun, France, on Tuesday.

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Anyone who's watched coverage of the grueling mountain stages of the Tour de France has seen them – the messages of support painted on the roads ahead of the race. This year they've taken a decidedly techie turn.

A collaboration between Lance Armstrong's LIVESTRONG foundation and Nike has brought about "Chalkbot," a robot that paints messages of support submitted by the public on the Tour's roads in water-soluble (and biodegradable soy-based) yellow paint. Armstrong, a seven-time Tour de France champion, has said that his main motivation for returning to professional cycling was to raise cancer awareness.

The rig used in the campaign, developed by Pittsburgh-based mobile software company Deeplocal and Standard Robot, is a similar concept to what "Bikes Against Bush" creator Joshua Kinberg used (and was arrested for) at the 2004 Republican National Convention in New York. Mr. Kinsberg's bike-mounted rig used cans of water-soluble paint to write messages sent from the Web on the streets of New York. Each message was geotagged, and a built-in digital camera sent pictures of the message to its submitter.

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