News

  1. Earth

    Ozone hole might not recover until the year 2065

    The ozone-free zone that develops high in the atmosphere over Antarctica each summer as the result of the presence of chlorine- and bromine-containing chemicals may not heal until 15 years later than previously projected.

    By Sid Perkins
  2. Health & Medicine

    Protein predicts sickle-cell danger

    A biological marker of heart trouble can be used to identify sickle-cell anemia patients who are at greatest risk of developing a serious, disease-related complication.

    By Ben Harder
  3. Health & Medicine

    Transfusions harm some heart patients

    Patients who undergo coronary-bypass surgery frequently receive unnecessary blood transfusions as part of their follow-up care.

    By Ben Harder
  4. Health & Medicine

    Old drug, new trick

    The drug rapamycin, now used in transplants, may make chemotherapy for acute lymphoblastic leukemia more effective.