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  1. Earth

    Mineral hunting, mob math and more reader feedback

    Readers ask about Earth's most abundant mineral and discuss the notoriously unpredictable behavior of pedestrians.

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  2. Physics

    How a violin’s f-holes influence its sound

    F-shaped holes move air faster, allowing classic violins to put out more powerful sounds at lower frequencies than their ancestors, a new study shows.

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  3. Physics

    Raindrops kick up soil chemicals

    The champagne-like fizz produced when a raindrop hits the ground may be responsible for the earthy aroma after a rainstorm.

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  4. Psychology

    Adults with autism are left to navigate a jarring world

    Researchers are beginning to study ways to help adults with autism navigate independently, get jobs and find friendship.