Uncategorized

  1. Health & Medicine

    Little vessels react to magnetic switch

    Magnets can act like vascular switches, increasing or decreasing blood flow to a region of the body.

    By Janet Raloff
  2. Earth

    Traces of lead cause outsize harm

    Minute amounts of lead in blood are worse for children than had been realized.

    By Ben Harder
  3. Math

    Recycling Topology

    It’s hard to miss the triangle of three bent arrows that signifies recycling. It appears in newspapers and magazines and on bottles, envelopes, cardboard cartons, and other containers. The recycling symbol. Alternative (incorrect?) rendering of the recycling symbol. Cliff Long made a Möbius band the basis of his wood carving “Bug on a Band.”