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  1. Health & Medicine

    Chemotherapy drug may in fact strengthen some cancer cells

    Research shows a standard drug for treating brain cancer can actually make some cells more aggressive.

    By Laura Sanders
  2. Tech

    Watching Earth for 25 years

    The Landsat 5 satellite launched in 1984 with a mission to orbit and image Earth's surface for three years. Still in orbit, the satellite has continuously documented changes in landscape.

    By Sid Perkins
  3. Health & Medicine

    New drug shows benefits against nasty asthma

    An experimental drug called mepolizumab prevents some emergency asthma attacks in people who no longer benefit from normal doses of steroids.

    By Nathan Seppa
  4. Astronomy

    These cosmic gluttons may be tight

    Researchers may have discovered the most tightly bound pair of supermassive black holes known, an indication that two massive galaxies have merged.