AMERICA's dominance in the field of supercomputing has slipped over the past decade, according to the latest TOP500 chart, a biannual list of the world's fastest number-crunching machines. Having accounted for 56% of the top 50 machines a decade ago, America now accounts for 40%. Japan has lost ground too, while Britain and Germany have held steady. The greatest gains have been made by France, due in part to the use of supercomputers in the energy industry, and China, which had no supercomputers in the top 50 a decade ago, but now has four, including the world's second-fastest machine, at the National Supercomputing Centre in Shenzhen. Other countries have also moved up the rankings, which indicates that supercomputers are more widely distributed around the world than they used to be: the top 50 machines include computers in South Korea, Saudi Arabia, Switzerland and India.

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