Researchers demonstrate optical backflow of light

Researchers at Tel Aviv University have for the first time demonstrated the backflow of optical light propagating forward. The phenomenon, theorized more than 50 years ago by quantum physicists, has never before been demonstrated ...

Tiny 'bridges' help particles stick together

It happens outside your window every time it rains: The soil gets wet and may form sticky mud. Then it dries. Later it might rain again. Each wetting and rewetting affects the structure and stability of the soil. These changes ...

Making simulated cosmic dust—in the microwave

Cosmic dust is the key to the chemical evolution of stars, planets, and life itself, but its composition is not well understood, and we can't currently collect samples for analysis. A few examples have arrived on Earth as ...

Improving the manipulation of microparticles by sound

A simple but accurate theory of how sound interacts with small particles has been developed by theoretical physicists at RIKEN. This advance will help to improve the manipulation of microparticles by sound.

Tiny pharmaceuticals in the environment

Fear is a bad counselor. In the comic book series "Asterix," the Gaul chief Vitalstatistix may be afraid that the sky may fall on his head. In the real world, however, risks should be assessed with a clear mind. To ensure ...

Clusters of gold atoms form peculiar pyramidal shape

Freestanding clusters of 20 gold atoms take the shape of a pyramid, researchers have discovered. This is in contrast with most elements, which organize themselves by forming shells around one central atom. The team of researchers ...

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