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  1. Math

    Chemical Dissections

    In recreational mathematics, a geometric dissection involves cutting a geometric figure into pieces that you can reassemble into another figure. For example, it’s possible to slice a square into four angular pieces that can be rearranged into an equilateral triangle. The same four pieces can be assembled into a square or an equilateral triangle. Sets […]

    By Ivars Peterson

  2. From Bone to Brain: Transplanted male bone marrow makes nerve cells in women and girls

    Transplanted bone marrow can form new nerve cells in the brains of people.

    By John Travis

  3. 19171

    After reading this article, I couldn’t believe that the manuscript didn’t identify the chemical substance involved.