News

  1. Health & Medicine

    New tests may catch bicyclers on dope

    Two new tests, on blood and urine, detect the presence of synthetic erythropoietin, a drug that boosts red blood cell counts and enhances stamina.

    By Nathan Seppa
  2. Health & Medicine

    Did colonization spread ulcers?

    A comparison of strains of Helicobacter pylori, the bacterium that causes ulcers, suggests that colonists brought it to the New World.

    By Nathan Seppa

  3. Biodiversity may lessen Lyme disease

    A survey of Lyme disease rates suggests that a greater diversity of small mammals and lizards may help keep the rates down.

    By Susan Milius

  4. Old lemming puzzle gets new answer

    A novel analysis suggests food supply variations as the answer to the decades-old puzzle of what makes lemming populations boom and bust.