News

  1. Astronomy

    Cosmic Ray Font: Supernova remnants rev up ions

    High-resolution X-ray images of the Tycho supernova remnant offer new evidence that supernova shock waves generate most cosmic rays that bombard Earth.

    By Ron Cowen
  2. Health & Medicine

    Give It Up: Cutting back helps, but even a cigarette or two a day carries risks

    Reducing tobacco use curbs the risk of lung cancer, but smoking even a few cigarettes a day puts a person at three to five times the risk faced by a nonsmoker.

    By Nathan Seppa
  3. Health & Medicine

    Better Beta: Cells grown in lab may treat diabetes

    Scientists have developed a technique to mass-produce a type of pancreas cell needed for transplants into people with type 1 diabetes.