News

  1. Earth

    DNA pinpoints poached ivory tusks

    Scientists tracked the origin of an illegal ivory shipment to Zambia by using an improved DNA-analysis technique to study the confiscated tusks.

    By Patrick Barry
  2. Planetary Science

    A crack at life

    New images of ancient cracks on Mars suggest that liquid may have percolated through underground rock on the Red Planet, providing a possible habitat for primitive life.

    By Ron Cowen
  3. Paleontology

    Ancient slowpoke

    A 1-centimeter-long, 505-million-year-old fossil from British Columbia represents a creature that joins two lineages of marine invertebrates from that era that scientists previously hadn't linked.

    By Sid Perkins
  4. Earth

    Equal Opportunity Outcome: Different pollutants show same impact

    At concentrations present in the environment, each of three dissimilar toxic agents can seize control of a signaling pathway that regulates developing cells in the central nervous system.