"You see it in Israel and Palestine, Georgia and Russia, Pakistan and India, " said Eugene Spafford, a computer security specialist at Purdue University who has advised two U.S. presidents and numerous companies and government agencies.

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In addition to Walker, five witnesses testified Thursday morning, including officials with cell phone companies and a computer forensic specialist for the Ohio Bureau of Investigation who testified about her analysis of the contents of 17 cell phones examined by police.

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Gonggrijp, a Dutch computer security specialist, and Jonsdottir, a citizen of Iceland and member of its national parliament, moved to vacate that order.

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They used CT scans and photographs of the skull, combined with a specialist computer programme, to reconstruct the king's face.

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The announcement was widely welcomed by the computing industry though concerns have been expressed about a lack of specialist computer science teachers.

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"Silicon photonics for years was an oxymoron, " said Joe Campbell, a specialist in the field who is a professor of electrical and computer engineering at the University of Virginia.

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By turning their problem into a game, the scientists have harnessed thousands of human brains without specialist knowledge to work on protein-folding, says Adrien Treuille, a computer scientist at Carnegie Mellon University who helped to develop the program.

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