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Scientists are learning more than ever before about the structure and properties of the Earth's crust and upper mantle -- bringing them to the brink of discoveries about earthquakes that could one day save millions of lives.

Environmental Protection Agency chief Mike Leavitt signed new regulations Tuesday aimed at cutting pollutants from diesel engines in off-road vehicles such as farming and construction equipment by 90 percent over the next eight years.

The commission Congress created to investigate the security of electronic voting machines said the software is not reliable enough for use in the 2004 presidential election. Spencer Michels looks at the controversy in California over electronic voting methods.

Since 1990, the Hubble Space Telescope has been supplying scientists with reams of information about our universe. Tom Bearden reports that, despite its successes, safety concerns may prevent NASA from making the necessary repairs to the telescope.

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