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  1. Tech

    Robosaur roams with spring in its step

    The novel dinosaur robot Troodon takes two-legged walking machines onto new terrain.

    By Peter Weiss
  2. 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
  3. 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
  4. 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.