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  1. Tech

    Polymer takes dim view of explosives

    By spraying surfaces with a light-emitting polymer, researchers have taken a step toward making new sensors for traces of common explosives.

    By Peter Weiss
  2. Paleontology

    Sahara yields second-largest dinosaur

    Excavations near an Egyptian oasis have unearthed the fossils of an animal that probably ranks as the second-most-massive dinosaur known.

    By Sid Perkins
  3. Paleontology

    Fossil footprints could be monumental

    Trace fossils found in a vacant lot in a small town in Utah, including the footprints of meat-eating dinosaurs, could soon be protected as part of a new U.S. national monument.

    By Sid Perkins
  4. Chemistry

    Hassium holds its place at the table

    Researchers have performed the first ever chemical studies on the element hassium.