News

  1. Health & Medicine

    Acetaminophen in Action: Effect on an enzyme may stop pain, lower fever

    The discovery of an enzyme scientists are calling cyclooxygenase-3, which is disabled by acetaminophen, might explain why this drug can stop pain and fever but not inflammation.

    By Nathan Seppa
  2. Astronomy

    Hole in the Middle: Are midsize black holes the missing link?

    Two teams of astronomers reported that they had confirmed the existence of a new class of black hole.

    By Ron Cowen
  3. Earth

    Cancer Causer? Researchers zero in on leukemia risks

    Researchers add to mounting evidence that household pesticide exposure may be a significant risk factor for childhood leukemia.

    By John Pickrell
  4. Paleontology

    Veggie Bites: Fossil suggests carnivorous dinosaurs begat vegetarian kin

    Chinese rocks have yielded fossil remains of a creature that had rodentlike incisors and a hefty overbite, providing the first distinct dental evidence for plant-eating habits among theropod dinosaurs.