Uncategorized

  1. Math

    Pursuing punctured polyhedra

    A mathematician has proved that it's possible to construct a mathematical shape made up of flat faces and straight edges in which every face has a "hole" where the vertex of one constituent polyhedron pokes into the face of another.

    By Ivars Peterson
  2. Health & Medicine

    New tests may catch bicyclers on dope

    Two new tests, on blood and urine, detect the presence of synthetic erythropoietin, a drug that boosts red blood cell counts and enhances stamina.

    By Nathan Seppa
  3. Health & Medicine

    Did colonization spread ulcers?

    A comparison of strains of Helicobacter pylori, the bacterium that causes ulcers, suggests that colonists brought it to the New World.