People would share links and add each others to web rings.

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"I think they do need to maybe explain more, tell more about what's being done to make London ready for the Olympics in that sense -- transportation -- because that was one of the key issues before the vote in Singapore (when London won the Games in 2005), " said Ed Hula, the editor and founder of Olympics Web site Around the Rings.

CNN: London marks three years until Olympics

His Web page is filled with instructive videos about gyroscopes, rings wobbling down rods, and boomerangs.

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