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Physics-informed AI learns local rules behind flocking and collective motion behaviors

Researchers at Seoul National University and Kyung Hee University report a framework to control collective motions, such as ring, clumps, mill, flock, by training a physics-informed AI to learn the local rules that govern interactions among individuals.

The paper is published in the journal Cell Reports Physical Science.

The approach specifies when an ordered state should appear from random initial conditions and tunes geometric features (average radius, cluster size, flock size). Furthermore, trained on published GPS trajectories of real pigeons, the model uncovers interaction mechanisms observed in real flocks.

Novel film manufacturing technique lets robots walk on water

Imagine tiny robots zipping across the surface of a lake to check water quality or searching for people in flooded areas. This technology is moving closer to reality thanks to work by researchers at the University of Virginia’s School of Engineering and Applied Science. Inspired by nature and insects such as water striders that walk on water, they created two prototype devices that can propel themselves across liquid surfaces.

The first, called HydroFlexor, paddles across a surface using fin-like motions. The second, named HydroBuckler, “walks” forward with a buckling motion that mimics the water-walking insects. The key innovation that made this possible is a technology developed by the team called HydroSpread.

To float and move on the surface of a liquid, robots need ultrathin, flexible films. Traditional approaches to making such films involve manufacturing them on a rigid surface, such as glass, and then transferring them to water, which often damages or breaks the film. However, the HydroSpread technique allows the films to be made directly on the liquid.

When mom and dad’s DNA don’t match up, the embryo finds a way

When a sperm meets an egg, a lot has to go right for an embryo to develop into a complete organism. One critical step of early development is the reorganization of parental DNA to form a new unified genome, before the embryo can undergo its first cell division.

Scientists have long known that sperm and eggs bundle their DNA differently. But it’s been assumed that their centromeres—the special regions of each chromosome that act like handles to pull DNA apart during —were essentially the same. That assumption rested on the presence of protein A, or CENPA, a unique histone protein that marks centromeres and preserves their identity across each cell division and across generations.

Because CENPA acts like a molecular tag, preserving these sites as “do not erase” regions of the genome, the centromeres were thought to be functionally indistinguishable between maternal and .

Optic nerve added to multiple sclerosis criteria in major diagnostic update

The International Advisory Committee on Clinical Trials led a multinational panel updating the McDonald criteria, adding the optic nerve as a fifth anatomical location and allowing specific magnetic resonance imaging (MRI) and cerebrospinal fluid (CSF) markers to support diagnosis without mandatory dissemination in time in defined scenarios.

Multiple sclerosis has long required proof that occur in different places and at different times, with MRI and CSF biomarkers gradually shortening time to treatment.

Previous revisions improved sensitivity and specificity across ages and regions, yet misdiagnosis risk still persists, especially with overlapping conditions and when access to specialized tests is limited.

Origins of the ‘Ostrich Effect’: Researchers pinpoint the age we start avoiding information—even when it’s helpful

In a world of information overload, it can feel soothing to stick your head in the sand.

Don’t want to hear what the doctor might say? It’s easy not to make a follow-up appointment. Did a favorite political candidate say something you disagreed with? The evidence can disappear with a flick of a finger.

According to psychologists, avoiding information when it’s uncomfortable is a common adult behavior, often referred to as the “Ostrich Effect.”

Coexisting magnetic states in 2D material promise major energy savings in memory chips

It is anticipated that within just a few decades, the surging volume of digital data will constitute one of the world’s largest energy consumers. Now, researchers at Chalmers University of Technology, Sweden, have made a breakthrough that could shift the paradigm: an atomically thin material that enables two opposing magnetic forces to coexist—dramatically reducing energy consumption in memory devices by a factor of 10.

This discovery could pave the way for a new generation of ultra-efficient, reliable memory solutions for AI, and advanced data processing.

The article, “Coexisting Non-Trivial Van der Waals Magnetic Orders Enable Field-Free Spin-Orbit Torque Magnetization Dynamics” has been published in Advanced Materials.

Chemists solve century-old mechanistic puzzle of copper catalyst

The Ullmann reaction is one of the oldest reactions in organometallic chemistry. It is one of the most widely used copper-mediated coupling reactions, widely applied in the construction of carbon-carbon and carbon-heteroatom bonds due to its excellent substrate generality.

There has been considerable controversy regarding the redox mechanism of copper in this reaction for a long time. The widely accepted mechanistic hypothesis involves a Cu(I/III) cycle. However, copper(III) species are extremely difficult to observe in real reaction systems, and whether other interactions exist between copper species remains unknown.

In a study published in Nature on September 22, Shen Qilong’s lab from the Shanghai Institute of Organic Chemistry of the Chinese Academy of Sciences, along with Professor K. N. Houk from the University of California, Los Angeles, provided solid evidence that the Ullmann-type reaction might proceed via a Cu(I)/Cu(III)/Cu(II)/Cu(III)/Cu(I) catalytic cycle.

Energy-efficient catalyst converts water pollutants into useful ammonia

When the current method for producing something is estimated to consume a staggering 1–2% of the annual global energy supply, it means we need to make a change. The Haber-Bosch process produces ample amounts of ammonia (NH3)—a valuable chemical compound that has a wide array of uses in fields such as agriculture, technology, and pharmaceuticals—while consuming a lot of energy.

A research team at Tohoku University has made a significant contribution to an alternate method for converting harmful nitrate pollutants in water into ammonia, addressing both environmental and energy challenges.

Their findings are published in Advanced Functional Materials.

How diamond fails under extreme electrical fields

A research team from the University of Chinese Academy of Sciences has revealed the failure mechanism of diamond under extreme electrical fields through in situ experiments and molecular dynamics simulations. The study, published in Cell Reports Physical Science, provides critical insights for the design of robust diamond devices.

Diamond is known for its exceptional physical properties, including ultra-high breakdown field strength and , making it a promising material for and high-power electronics. However, its failure process under extreme electrical fields has remained poorly understood before now.

Led by Profs. Yan Qingbo and Chen Guangchao, the researchers used an in situ transmission electron microscopy (TEM) method to observe the breakdown process in real time. They found that diamond failure begins preferentially along the (111) crystal plane due to stress-induced lattice distortion and subsequent amorphization, rather than transforming into graphite.

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