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  1. Dolly, first cloned mammal, is dead

    Dolly, the first clone of an adult mammal, has been euthanized after acquiring a severe lung infection.

    By John Travis
  2. Materials Science

    Ceramic rebounds from stressful situations

    The ceramic titanium silicon carbide can fully recover after being compressed to a degree that would leave most ceramics shattered and most metals permanently deformed.

    By Jessica Gorman
  3. Chemistry

    A safer antioxidant?

    Scientists have developed a synthetic antioxidant that won't, at high doses, foster the tissue damage the compounds are meant to prevent.

    By Janet Raloff
  4. Tech

    Worms may spin silk fit for skin

    Silk cocoons could become puffs of valuable human proteins if a new bioengineering method pans out.