Alles Gute zum Geburtstag! Joyeux Anniversaire! Suk San Wan Keut! Sun Yat Fai Lok! Hartelijk gefeliciteerd! Felichan Naskightagon! And Happy Birthday to Google in the other 93-plus languages it speaks!

As the web search engine Google celebrates its 10th birthday it is hard to imagine life online without it. It has become such an indispensable tool that we don't just search for something any more, we "google" it, as recognised by the Oxford English Dictionary in 2006. What many people don't realise is that Google's rise to become one of the most successful search engines on the web today is due to the mathematical algorithm PageRank, devised by Sergey Brin and Lawrence Page, the founders of Google. This algorithm not only decides which webpages match your search criteria (which all search engines do), but also which are more important and returns these at the top of the results.

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