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  1. Earth

    Danger in the Air

    To minimize the threat of volcanic ash plumes to aircraft, scientists are improving methods of satellite detection and developing ground-based gas and ash-plume sensors to monitor volcanic activity.

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  2. Chemistry

    Blue halos of doom

    Under ultraviolet light, rings around the brown spots in aging bananas may signal the transition from ripe to rotten, researchers say.

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  3. Three genes linked to Alzheimer’s disease risk

    Three new genes that raise the risk of developing Alzheimer’s disease have been discovered in two large genome-wide searches.

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  4. Health & Medicine

    Tetris players are not block heads

    Playing the geometry-based computer game can boost the brain’s gray matter.