News

  1. Health & Medicine

    TB vaccine gets a needed boost

    An experimental vaccine against tuberculosis imparts significant immunity, but only in people who have previously received the existing bacille Calmette-Guérin vaccine for TB.

    By Nathan Seppa
  2. Astronomy

    Gamma view of a big blast

    Astronomers have for the first time used extremely high-energy gamma rays to image a celestial body.

    By Ron Cowen
  3. Health & Medicine

    Sleeve worn on heart fights failure

    A new mesh wrap can be placed around an expanded and weakened heart to restore the organ to an efficient, elliptical form.

    By Ben Harder
  4. Health & Medicine

    Up and down make different workouts

    An unusual study conducted on an Alpine mountainside suggests that climbing a steep slope improves the body's ability to process certain fats, while descending such a slope enhances metabolism of a key sugar.