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  1. Math

    Prime Effort: Powerful conjecture may be proved

    A mathematician may have finally proved Catalan's conjecture, a venerable problem in number theory concerning relationships among powers of whole numbers.

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  2. Physics

    Tiny tungsten beams lord over light

    By filtering radiated heat, a novel microstructure of crisscrossed tungsten beams promises to improve the efficiency of light bulbs and of heat-to-electricity conversion devices.

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  3. Health & Medicine

    Freeing up the mouse genome

    Scientists have assembled the DNA sequences from a strain of the common lab mouse and made the draft genome available for free over the Internet.

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  4. Would-be brain boosters need data lift

    Research has yet to confirm that the herb Ginkgo biloba and other nonprescription nutrients enhance memory and intellect.