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  1. Physics

    Layers in a Stradivarius

    Slight differences in the wood from which violins are made might be what distinguishes a mellow-toned Stradivarius from an ordinary instrument.

    By Sid Perkins
  2. Health & Medicine

    Surviving HIV

    Since the development in the mid-1990s of a state-of-the-art drug cocktail for HIV, patient survival has extended dramatically, a new study shows.

    By Nathan Seppa
  3. Animals

    Live fast, die young

    With a lifespan of just five months, the chameleon Furcifer labordi leads a briefer life than any other land-dwelling vertebrate.

    By Amy Maxmen
  4. Math

    Optimizing leafy networks

    Scientists reveal a mathematical principle underlying the arrangement of leaf veins in plant species.