Page last updated at 11:13 GMT, Monday, 18 May 2009 12:13 UK

Wolfram explains engine creation

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A search engine hailed as a significant rival to web giant Google has gone live to the public.

Wolfram Alpha is called a computation knowledge engine rather than a search engine and wants to change the way people use online data.

The system is the brainchild of British-born physicist Stephen Wolfram, and he spoke to the BBC from his headquarters in Illinois.

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