In case you haven't heard the story, hete it is -
 
http://www.npr.org/templates/story/story.php?storyId=120587095
 
When I was listening the story on the way to office, my thoughts immediately related this story with "use rotation sensor counts to measure the traveling distance without considering the variability from wheel, slippage etc".
 
The nature sometimes is not perfect, right?
 
Jin


      

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