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  1. Astronomy

    Alien stars pass close to home

    Stars from an alien galaxy are raining down on our own Milky Way and passing just a few hundred light-years from Earth.

    By Ron Cowen
  2. Health & Medicine

    Nanoparticles hunt down and kill tumors

    Gold nanoparticles, injected into mouse tumors and exposed to light, have been found to destroy cancer cells, a treatment approach that may one day offer an alternative to surgery.

    By Alexandra Goho
  3. Physics

    Hints emerge of a four-quark particle

    Previously observed only in twos, threes, and perhaps in fives, quarks and antiquarks in a newfound particle may have glommed together to form a never-before-seen foursome.

    By Peter Weiss
  4. Health & Medicine

    Discovery of Insulin

    In 1923, the Nobel Prize in Medicine went to Frederick Banting and J.J.R.