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  1. Physics

    Scales tilt against five-quark particles

    Studies that fail to find purported five-quark particles, or pentaquarks, are stacking up quicker than studies that claim to have found such particles, suggesting that they might not really exist.

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  2. Physics

    Test puts pedal to heavy metal

    Stellar explosions forge heavy elements such as gold more quickly than scientists had predicted, as indicated by the first measurement of the half-life of a rare form of nickel that's a key link in the chain of element formation.

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  3. Chemistry

    Crystal clear

    Growing drug crystals on different polymer surfaces could improve a critical step in the development of pharmaceuticals.