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  1. Bacteria give carpet a nasty smell

    A compound produced by bacteria may be responsible for the "cat urine" smell of some new carpeting.

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  2. Pen-shaped device purifies water

    A battery-powered instrument the size and shape of a pen can quickly disinfect contaminated drinking water.

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  3. Molecule sparks origin-of-life debate

    The first genetic material may have been a molecule called peptide nucleic acid, or PNA.

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  4. RNA and DNA help cells switch class

    Immune cells may tailor their genetic blueprint for antibodies through unusual RNA-DNA structures.

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  5. Astronomy

    More evidence of a flat universe

    Another balloon-borne experiment recording relic radiation from the Big Bang has found evidence that the universe is flat.