New 'metalens' shifts focus without tilting or moving

Polished glass has been at the center of imaging systems for centuries. Their precise curvature enables lenses to focus light and produce sharp images, whether the object in view is a single cell, the page of a book, or a ...

More than 1 million barriers on Europe's rivers: study

More than 1.2 million barriers criss-cross Europe's rivers—nearly twice as many as previously thought—threatening some of the world's most diverse ecosystems, new research showed Wednesday.

Methane in tidal marshes

A pair of University of Delaware researchers were studying "blue carbon"—the carbon stored in coastal ecosystems such as mangrove forests, salt marshes or sea grasses—when they found something no one expected to see in ...

An innovative method to tune lasers toward infrared wavelengths

Researchers at Institut national de la recherche scientifique (INRS) have discovered a cost-effective way to tune the spectrum of a laser to the infrared, a band of great interest for many laser applications. They collaborated ...

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