News

  1. Life

    In evolution, last really can be first

    By tracking bacteria for thousands of generations, researchers show how small DNA changes can eventually put underdogs on top.

    By Tina Hesman Saey
  2. Archaeology

    Pueblo traded for chocolate big-time

    New evidence of ancient Pueblo cacao drinking feeds a theory of long-distance trade.

    By Bruce Bower
  3. Humans

    Record ozone thinning looms in Arctic

    Depletion could expose the northern midlatitudes to higher-than-normal ultraviolet radiation in coming weeks.

    By Janet Raloff
  4. Earth

    Cave formations record Black Sea deluges

    Stalagmites in a Turkish grotto document 670,000 years of flooding.

    By Daniel Strain
  5. Astronomy

    New study gives dark energy a boost

    Measurements provide further evidence for a cosmic push that is accelerating the expansion of the universe.