By Emma Barnett, Technology Correspondent
Last Updated: 12:23PM BST 21 May 2009

Wolfram Alpha, a computational search engine, launched on Monday, May 18, and aims to return a single search result with the right answer, rather than a list of thousands of web pages, from data stored on its own database.
This new add-on, available on Mozilla Firefox, allows users to receive results from both search engines simultaneously. The Google results come in at a normal speed, while the Wolfram Alpha ones catch-up on the side.