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  1. Tech

    Cold Lighting

    Solid-state light sources, such as light-emitting diodes, promise greater energy efficiency than do incandescent lamps. The Sandia National Laboratories has launched a Web site that offers articles, references, and other information on semiconductor-based lighting and its use for illuminating homes, offices, and public spaces. Go to: http://lighting.sandia.gov/

    By Science News
  2. Math

    Prime Spirals

    Precisely defined yet enticingly elusive, prime numbers occupy a central place in number theory. Evenly divisible only by themselves and 1, these special integers–2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, and so on–pose all sorts of conundrums. In a square grid, numbering squares instead of line intersections serves as […]

    By Ivars Peterson
  3. Astronomy

    Sharper Images: New Hubble camera goes the distance

    Astronomers have unveiled a picture of the distant universe that ranks as the sharpest and most detailed ever recorded.