Feature

  1. Astronomy

    Big Broadcast

    A record-breaking radio burst from the sun last Dec. 6 temporarily overwhelmed scores of GPS receivers, highlighting the hazard of radio storms on Earth.

    By Ron Cowen
  2. Tech

    Powering the Revolution

    Sensors and other electronic devices that can scavenge energy could open a new realm for technology.

    By Mitchell Waldrop
  3. Ecosystems

    Slime Dwellers

    The health of corals, and their adaptability in the face of adversity, may rest largely on the microbes they recruit into a slime that coats their surfaces.

    By Janet Raloff
  4. Tech

    Reaching for Rays

    Harnessing the sun's rays cheaply and efficiently could address the planet's energy needs.