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  1. Physics

    Scanner Darkly: Tiny venetian blinds enhance radiography

    Microscopic gratings that select scattered X rays might improve luggage screening and cancer detection.

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  2. Do-It-Yourself DNA: Scientists assemble first synthetic genome

    Assembly of the first human-made microbial genome could pave the way for making microbes with synthetic DNA.

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  3. Ecosystems

    Big Foot: Eco-footprints of rich dwarf poor nations’ debt

    The first global accounting finds rich and middle-income nations stomping heavy footprints on poorer ones.

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  4. Math

    Benjamin Franklin Plays Sudoku

    Founding father entertained himself devising beautiful mathematical puzzles.

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  5. Astronomy

    Four’s a crowd

    Astronomers have found a quartet of stars packed into a region smaller than Jupiter's orbit around the sun.