Great Debates

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In the final part of this series, the debate participants respond to questions posed by our readers.... more

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Interviews

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What have scientists learned in a decade of searching for extrasolar planets? Are there other solar ... more

Expeditions

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If you're looking for the world's tallest mountains, head for the Himalayas. But if your objective i...  more

Retrospections

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Science-fiction author, Sir Arthur C. Clarke, provides perspective on the tsunami disaster from his ... more

News Exclusives

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The light reflected off of vegetation could be a signal of life on an alien planet. Researchers have... more