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  1. Math

    Prime Pursuit

    A novel approach for identifying prime numbers provides a long-sought improvement in the theoretical efficiency of prime-detecting algorithms.

    By Ivars Peterson
  2. Physics

    Intergalactic magnetism runs deep and wide

    Mounting evidence that magnetic fields of surprising strength permeate intergalactic space raises questions about how the fields form and what effects they have.

    By Peter Weiss
  3. Health & Medicine

    Drug Eases Bone Cancer Pain in Mice

    Pain caused by bone cancer in mice can be alleviated somewhat by osteoprotegerin, a drug being tested for osteoporosis, suggesting a possible new treatment for people with this cancer.

    By Nathan Seppa
  4. Math

    Changes of Mathematical State

    Untangling a web of conflicting demands can be tough on computers.