In the realm of science fiction, Dyson spheres and ringworlds have been staples for decades. But it is well known that the simplest designs are unstable against gravitational forces and would thus be torn apart. Now a scientist from Scotland, UK has shown that certain configurations of these objects near a two-mass system can be stable against such fractures. The work is published in the journal Monthly Notices of the Royal Astronomical Society.

Amazon is killing its “Do Not Send Voice Recordings” privacy feature on March 28 as the company aims to bolster Alexa+, its new subscription assistant.

University allocates funding and contact point for U.S. scholars looking to relocate to Brussels

New Delhi considers safeguard duty as oversupply from China, South Korea, Japan looms.

An employee at a steel factory in India: Over the past few years, steel prices in the country have been driven down by an influx of finished steel, especially from China. © Reuters.

The result is sickness, starvation and death.

How Trump might drive proliferation.

China is leveraging its globally dominant commercial shipbuilding industry to support its naval modernization—and foreign companies are inadvertently helping. This report outlines how the United States and its partners can confront China’s dual-use shipyards.

Measuring how efficiently an isotope captures neutrons of various energies both confirms and refutes some surprising recent results.

Optical fibers provide an excellent platform for transmitting light over long distances, manipulating it and enhancing light-matter interaction. Now, the “Ultrafast & Twisted Photonics” research group at the Max Planck Institute for the Science of Light (MPL) has developed a new hollow-core fiber that selectively guides optical vortices depending on their helicity and has potential applications in chiral sensing, vortex mode generation, and optical communications.

The results were recently published in the journal ACS Photonics.

In addition to transmitting light over long distances, optical waveguides provide convenient ways of enhancing the interaction of light with matter and manipulating the properties of the guided light. Among several light attributes, pure polarization states are crucial for many applications and research areas.