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EarthOn 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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PhysicsToward 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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PhysicsThis 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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AstronomyEclipsing 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.