Uncategorized

  1. Math

    Cracking the Cube

    A combination of mathematical analysis and supercomputer number-crunching proves that any Rubik's Cube can be solved in 26 moves or fewer.

    By Julie Rehmeyer
  2. Earth

    Hammered Saws

    Sawfish, shark relatives that almost went extinct several decades ago, have now gained protection by international treaty.

    By Janet Raloff
  3. Health & Medicine

    Taking a Jab at Cancer

    Vaccines that train a person's immune system to kill cancerous cells, when combined with drugs that block tumor defense mechanisms, are starting to show promise.

    By Patrick Barry
  4. Humans

    Letters from the August 11, 2007, issue of Science News

    Sum kids While testing was done on 5- or 6-year-old children (“Take a Number: Kids show math insights without instruction,” SN: 6/2/07, p.