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  1. Health & Medicine

    Trade Center cough is diagnosed

    Obstructions that trap air deep within the lungs may explain certain breathing difficulties among some people who worked at the site of the World Trade Center following Sept. 11, 2001.

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  2. Materials Science

    A light wrap?

    Materials scientists have created fabrics that can both detect light and conduct electricity.

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  3. Growing where they haven’t grown before

    Researchers have found the right laboratory conditions for growing mouse precursor cells into sperm.

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  4. Animals

    Song Fights

    Birds settle many of their disputes by some rough-and-tough singing bouts, and recording equipment now lets researchers pick a song fight, too.