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Iraqi forces have made more gains in west mosul, the largest city still under the control of the Islamic State group. They claim to have cut the last road out of the city. Government troops, backed by a us led coalition, recaptured the east of the city in late january, after more than 100 days of fighting. Now they say a third of the west, which is almost completely surrounded, has been retaken. But around 600,000 civilians are still believed to be trapped inside. 0ur middle east correspondent 0rla guerin and cameraman nico hameon have been travelling with the iraqi forces. A warning, you may ...

The National Nanotechnology Coordination Office (NNCO) is organizing a series of National Nanotechnology Initiative (NNI) webinars on nanometrology, metrological challenges, and recent...

Using near-infrared light, researchers have darkened and brightened lanthanide-doped nanoparticles over 1000 times with no degradation.

Optical probes have led to numerous breakthroughs in applications like optical memory, nanopatterning, and bioimaging, but existing options have limited lifespans and will eventually 'photobleach.' New work demonstrates a promising, longer-lasting alternative: ultra-photostable avalanching nanoparticles that can turn on and off indefinitely in response to near-infrared light from simple lasers.

In 2021, lanthanide-doped nanoparticles made waves—or rather, an avalanche—when Changwan Lee, then a PhD student in Jim Schuck’s lab at Columbia Engineering, set off an extreme light-producing chain reaction from ultrasmall crystals developed at the Molecular Foundry at Berkeley Lab.