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  1. Earth

    On the rocks

    New research explains why a cancer-causing form of chromium has been turning up in ground and surface waters far from industrial sources.

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  2. Physics

    Toward imaging single biomolecules

    Experiments have given additional evidence that a future generation of X-ray sources called free-electron lasers may be able to image single biomolecules.

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  3. Physics

    This is your brain on a chip

    Biophysicists have put neurons on a chip and induced them to form multiple patterns of synchronized firing, the mechanism at the basis of memory.

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  4. Astronomy

    Eclipsing a black hole

    A chance eclipse has enabled astronomers for the first time to measure the width of a disk of swirling, hot matter around a supermassive black hole.