September marks 15 years since graduates Larry Page and Sergey Brin set up a small web crawler from a garage in Silicon Valley, which went onto become the world's biggest search engine.
The site was originally called BackRub, but was changed in 1997 to Google - a misspelling of the word googol which is a term for the number one followed by one hundred zeros.
There is a little confusion around when Google's official birthday is, but...
