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  1. Earth

    Hey polluters! This billboard’s for you

    Motorists generally like and respond to personalized billboard messages about when an engine tune-up may be warranted.

    By Janet Raloff
  2. Health & Medicine

    HIV sexual spread exploits immune sentinels

    The virus that causes AIDS latches onto a protein called DC-SIGN to hitch a ride on immune cells in mucus membranes and spread through the body.

    By John Travis
  3. Health & Medicine

    Cell transplants combat diabetes in mice

    Scientists have successfully reversed diabetes in mice by harvesting immature pancreatic cells that make insulin from one mouse, growing them in culture, and transplanting them into a mouse with the disease, which then recedes.