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  1. Health & Medicine

    Sickle Save: Skin cells fix anemia in mice

    Using a new technique to turn skin cells into stem cells, scientists have corrected sickle cell anemia in mice.

    By Brian Vastag
  2. Plants

    Botanists refine family tree for flowering plants

    Two research teams have used the biggest array of flowering-plant genes yet to try to reconstruct the elusive evolutionary history of today's flowers.

    By Susan Milius
  3. Physics

    Sharper than expected

    A new technique beats the resolution limits of ordinary microscopes in a way that seems to defy conventional optical theory.

    By Davide Castelvecchi
  4. Tech

    Tractor beam

    Magnetic nanoparticles selectively bind to specific bacteria and can drag them out of a liquid.