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       xkcd - A Webcomic - Spacetime Soccer (2705)
        
       Image:
 (PNG) spacetime_soccer.png
        
       Spacetime Soccer, known outside the United States as '4D
       Football' is a now-defunct sport. Infamous for referee decisions
       hinging on inconsistent definitions of simultaneity, it is also
       known for the disappearance of many top players during... [more]
        
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