News

  1. Health & Medicine

    High elevation linked to hormone dearth

    Elderly Peruvian women living at very high altitudes have lower blood concentrations of some key hormones than do their lowland counterparts.

    By Nathan Seppa
  2. 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.

    By Ivars Peterson
  3. 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.

    By Peter Weiss
  4. 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.