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  1. Earth

    Signs of ancient sea ice

    New analyses of Arctic seafloor sediments suggest floating ice debuted in the ocean at least 47.5 million years ago.

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  2. Earth

    Arctic images declassified

    High-res Arctic sea images should be declassified, says National Research Council.

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  3. Computing

    Random numbers faster

    Researchers have devised a way to use a laser to create strings of orderless bits for encryption.

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  4. Earth

    Bird deaths blamed on vitamin deficiency

    Shortage of thiamine may have been killing birds in the Baltic and possibly elsewhere for some 25 years.

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  5. Earth

    Erosion, on the down low

    Experiments show how microscopic fungi attack minerals to begin the erosion process.