Uncategorized

  1. Earth

    Resetting a clock from Earth’s rocks

    Better measurements of one of the rates of radioactive decay used to date extremely old rocks open up the possibility that Earth may have had a crust as many as 200 million years earlier than previously thought.

    By Sid Perkins
  2. Computing

    Web worms: Code Red to Warhol

    Using an efficient infection strategy, a malicious programmer could deploy a rogue computer program far more voracious than the Code Red worm that struck on July 19.

    By Ivars Peterson
  3. Ecosystems

    Wanted: Reef Cleaners

    Nearly 18 years after a near total die-off of algae-grazing urchins in the Caribbean, those herbivores are poised for a comeback—which could help save area corals.