Uncategorized

  1. Chemistry

    Oldest evidence for complex life in doubt

    Chemical biomarkers in ancient Australian rocks, once thought to be the oldest known evidence of complex life on Earth, may have infiltrated long after the sediments were laid down, new analyses suggest.

    By Sid Perkins
  2. Archaeology

    An ancient healer reborn

    A research team in Israel has uncovered one of the oldest known graves of a shaman. The 12,000-year-old grave hosts a woman’s skeleton surrounded by the remains of unusual animals.

    By Bruce Bower
  3. Math

    Unknotting knot theory

    New techniques are beginning to unravel the mysteries of knots, revealing a great mathematical superstructure in the process.

    By Julie Rehmeyer
  4. Space

    Hubble repair mission delayed yet again

    Even as the Hubble Space Telescope was able to snap an image after several weeks of idling, a mission to visit and upgrade Hubble suffered another delay.