Mr Page was excited by the web's mathematical characteristics, and set about pondering its link structure.
The project came to be called BackRub. He then began building out his crawler.
It was here that Mr Brin, a Russian-born son of a NASA scientist and a University of Maryland mathematics professor, pooled in with his talent.
Image: Google launched it's own version of instant messaging with Google Talk on August 24, 2005 in Mountain View, California | Photograph: David Paul Morris/Getty Images
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