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The entrepreneur, Elon Musk, has unveiled a prototype tunnel system in Los Angeles, designed to transport people around the city at high speed. A top American intelligence official has told the ÃÛÑ¿´«Ã½ that China is a far greater national security threat than Russia. And we hear more about the global mining giant Glencore which has run into trouble with the authorities in Canada over claims of corruption linked to its operations in the Democratic Republic of Congo.