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  1. Animals

    Blame winter for the vanishing sparrows

    Changes in winter farming practices may help explain a puzzling drop in number of rural house sparrows in southern England.

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  2. Hear, hear: Key ear part regenerates

    Hairlike projections that allow ears to detect sounds regenerate every 2 days.

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  3. Physics

    Clues to exotic particles found again

    Although a correction to theory last year watered down its results, further analysis of a muon experiment still provides hints of new subatomic particles.

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  4. Earth

    Uncertainty returns over sex-change fish

    Scientists question whether a potentially gender-bending hormone found in polluted Florida streams is responsible for masculinized female fish.