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  1. Gene therapy grows bone in mice and rats

    A new gene therapy tested in rodents regrows bone by transforming skin and gum cells into bone-making cells or into cells that mass-produce a molecule called bone morphogenetic protein-7, which induces bone growth.

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  2. Astronomy

    New sky map: Look, Ma, no Milky Way!

    Using a radio telescope to record emissions from hydrogen gas, astronomers have penetrated the murk of the Milky Way to map the entire southern sky.

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  3. Earth

    Bursting in Air: Satellites tally small asteroid hits

    On average, a small asteroid slams into Earth's atmosphere and explodes with the energy of 1,000 Hiroshima-size blasts once every thousand years or so, a rate that is less than one-third as high as scientists previously supposed.