Science

NASA Administrator Sean O'Keefe responds to a pointed report by the official accident investigation board on the destruction of the space shuttle Columbia.

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The Environmental Protection Agency revised an emissions rule to benefit older power plants. An EPA official and an environmentalist debate the rule's merits.

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Early this morning, Mars had its closest encounter with Earth in 60,000 years, giving observers the best view of the red planet in their lifetimes. Terence Smith discusses the event with astrophysicist Neil DeGrasse Tyson.

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An independent board investigating the breakup of the space shuttle Columbia released its final report Tuesday morning.

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With the release of a report Tuesday detailing the findings of an independent board's investigation into the Feb. 1 breakup of the space shuttle Columbia, experts discuss reaction to the report and what its recommendations may mean for NASA's future.

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An independent board announced that flawed practices at NASA and falling foam debris contributed to the space shuttle Columbia disaster last February.

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Growing levels of coastal erosion are washing away California's beaches. Jeffrey Kaye of KCET Los Angeles explores the problem and restoration efforts.

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Last week's sweeping power outages heated up the debate over the country's energy policies. Kwame Holman reports.

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A power grid failure on Thursday left much of the northeastern U.S. and parts of Canada without electricity. Experts discuss the structure and vulnerability of the U.S. electrical grid system.

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President Bush announced Monday that his choice to head the Environmental Protection Agency is Utah Governor Mike Leavitt, a Republican and an advocate of shifting environmental regulation to the states.

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