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Precessing magnetic jet engine model reveals power source of rare ‘heartbeat’ gamma-ray burst

Prof. An Tao from the Shanghai Astronomical Observatory (SHAO) of the Chinese Academy of Sciences has proposed a novel “precessing magnetic jet engine” model to explain the peculiar gamma-ray burst (GRB) 250702B, a rare cosmic explosion discovered on July 2, 2025.

This GRB exhibited periodic flares approximately every 47 minutes over more than three hours. The new model elucidates the physical origin of this “heartbeat” and resolves the mysteries surrounding its extremely hard spectrum and apparent excess energy. Results were published in The Astrophysical Journal Letters on December 2.

GRB 250702B was detected by high-energy observatories, including the Fermi satellite and Konus-Wind. Its uniqueness lies in its temporal structure. The entire burst lasted approximately 3.2 hours and included three distinct, intense gamma-ray pulses with intervals that were integer multiples of a base period of about 2,825 seconds. Interestingly, approximately one day prior to this event, China’s “Einstein Probe” satellite detected a softer X-ray burst at the same location, acting as a precursor to the main event. This combination of “early warm-up plus hour-scale heartbeat” is extremely rare in GRB observations.

Real-time social interactions reveal how we balance cooperation and competition

When people reach for the same object, walk through a narrow doorway, forage for food, or work together on a shared task, they continuously negotiate—often without noticing—how much to cooperate or compete. Unlike classical laboratory games that force players to choose between fixed options in advance, real-life interactions unfold dynamically, with movement timing and subtle cues shaping social behavior from one moment to the next.

A collaborative research team from the Max Planck Institute for Dynamics and Self-Organization (MPI), the University of Göttingen, and the German Primate Center—Leibniz Institute for Primate Research (DPZ) has developed a novel experimental framework that captures this natural complexity. Their study, published in Communications Psychology, reveals how human pairs spontaneously settle into stable cooperative, intermediate or competitive roles—and how these strategies arise from the interplay between social motives, cost-benefit constraints, and sensorimotor skills.

Laser-engineered nanowire networks could unlock new material manufacturing

A breakthrough development in nanofabrication could help support the development of new wireless, flexible, high-performance transparent electronic devices.

Researchers from the University of Glasgow’s James Watt School of Engineering have developed a new method of interfacial imprinting ultra-thin nanowires onto bendable, transparent polymeric substrates.

The team’s paper, titled “Laser-Engineered Interfacial-Dielectrophoresis Aligned Nanowire Networks for Transparent Electromagnetic Interference Shielding Films,” is published in ACS Nano.

Vapor-deposition method delivers unprecedented durability in perovskite–silicon tandem solar cells

NUS researchers have developed a vapor-deposition method that dramatically improves the long-term and high-temperature stability of perovskite-silicon (Si) tandem solar cells. The findings were published in Science.

This is the first time vapor deposition has been successfully applied to industrial micrometer-textured silicon wafers, the actual wafer structure used in commercial solar cell manufacturing, marking a major milestone for translating laboratory-scale tandem solar cells into real-world products.

The new method enables conformal, high-quality perovskite growth on industrial micrometer-scale textured silicon wafers, a critical requirement for mass production, and delivers more than 30% power-conversion efficiency with operational stability far exceeding 2,000 hours, including T₉₀ lifetimes —the time taken for performance to drop to 90% of initial output—of over 1,400 hours at 85°C under 1-sun illumination, a standard benchmark in solar energy representing a light intensity of 1,000 watts per square meter.

Ultra-low power, fully biodegradable artificial synapse offers record-breaking memory

In Nature Communications, a research team affiliated with UNIST present a fully biodegradable, robust, and energy-efficient artificial synapse that holds great promise for sustainable neuromorphic technologies. Made entirely from eco-friendly materials sourced from nature—such as shells, beans, and plant fibers—this innovation could help address the growing problems of electronic waste and high energy use.

Traditional artificial synapses often struggle with high power consumption and limited lifespan. Led by Professor Hyunhyub Ko from the School of Energy and Chemical Engineering, the team aimed to address these issues by designing a device that mimics the brain’s synapses while being environmentally friendly.

A Long-Standing Spintronics Mystery May Finally Be Solved

A long-standing explanation for magnetoresistance may be incomplete. New evidence suggests a universal interfacial mechanism is at play. A major advance in spintronics came with the discovery of unusual magnetoresistance (UMR). In this effect, the electrical resistance of a heavy metal changes wh

Einstein in a Chip: Hidden Geometry Bends Electrons Like Gravity

A team at UNIGE has uncovered a geometric structure once thought to be purely theoretical at the core of quantum materials, opening the door to major advances in future electronics. How can information be processed almost instantly, or electrical current flow without energy loss? To reach these g

Scientists Solve a Hidden Battery Cracking Mystery That Shortens Lifespan and Raises Fire Risk

A new study shows that promising single-crystal battery materials degrade for reasons scientists hadn’t fully recognized before. Scientists at Argonne National Laboratory and the UChicago Pritzker School of Molecular Engineering (UChicago PME) have identified the source of a long-standing problem

This Simple Chemistry Fix Could Revolutionize Flow Batteries

A new twist on bromine-based flow batteries could make large-scale energy storage cheaper, safer, and far longer-lasting. Bromine-based flow batteries store and release energy through a chemical reaction involving bromide ions and elemental bromine. This approach offers several advantages, includ

Russia-Linked Hackers Use Microsoft 365 Device Code Phishing for Account Takeovers

A suspected Russia-aligned group has been attributed to a phishing campaign that employs device code authentication workflows to steal victims’ Microsoft 365 credentials and conduct account takeover attacks.

The activity, ongoing since September 2025, is being tracked by Proofpoint under the moniker UNK_AcademicFlare.

The attacks involve using compromised email addresses belonging to government and military organizations to strike entities within government, think tanks, higher education, and transportation sectors in the U.S. and Europe.

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