Uncategorized

  1. Astronomy

    Sizing up a black hole

    Astronomers are closing in on the size of the supermassive black hole that lies at our galaxy's center.

    By Ron Cowen
  2. Archaeology

    Israeli cave yields Stone Age kills

    A recently discovered Israeli cave has yielded some of the earliest known evidence of hunting by humans or our evolutionary ancestors, from around 300,000 to 200,000 years ago.

    By Bruce Bower
  3. Anthropology

    Rock-solid choices of first toolmakers

    Human ancestors who took up stone toolmaking in Africa around 2.6 million years ago already showed a proclivity for choosing high-quality pieces of rock, a new study finds.

    By Bruce Bower
  4. Chemistry

    Flame-retardant cotton gets a boost from clay

    Mixing cotton fibers with nanoparticles of clay increases the materials' heat tolerance, ultimately rendering new cotton fabrics flame retardant.