Over the past few decades, solar cells have become increasingly widespread, with a growing number of individuals and businesses worldwide now relying on solar energy to power their homes or operations. Energy engineers worldwide have thus been trying to identify materials that are promising for the development of photovoltaics, are eco-friendly and non-toxic, and can also be easily sourced and processed.

These include kesterite-based materials, such as Cu₂ZnSnS₄ (CZTS), a class of semiconducting materials with a crystal structure that resembles that of the naturally occurring mineral kesterite. Kesterite solar cells could have various advantages over the conventional silicon-based photovoltaics that are most used today, including lower manufacturing costs, a less toxic composition and greater flexibility.

Despite their potential, kesterite solar cells developed to date attain significantly lower power conversion efficiencies (PCEs) than their silicon counterparts. This is in great part due to atomic-scale defects in kesterite-based materials that trap charge carriers and prompt non-radiative recombination, a process that causes energy losses and thus reduces the solar cells’ performance.

Cyberattacks can snare workflows, put vulnerable client information at risk, and cost corporations and governments millions of dollars. A botnet—a network infected by malware—can be particularly catastrophic. A new Georgia Tech tool automates the malware removal process, saving engineers hours of work and companies money.

The tool, ECHO, turns malware against itself by exploiting its built-in update mechanisms and preventing botnets from rebuilding. ECHO is 75% effective at removing botnets. Removing malware used to take days or weeks to fix, but can now be resolved in a few minutes. Once a security team realizes their system is compromised, they can now deploy ECHO, which works fast enough to prevent the botnet from taking down an entire network.

“Understanding the behavior of the malware is usually very hard with little reward for the engineer, so we’ve made an automatic solution,” said Runze Zhang, a Ph.D. student in the School of Cybersecurity and Privacy (SCP) and the School of Electrical and Computer Engineering.

Quasicrystals, exotic states of matter characterized by an ordered structure with non-repeating spatial patterns, have been the focus of numerous recent physics studies due to their unique organization and resulting symmetries. Among the quasicrystals that have sparked significant interest among the physics community are so-called quantum quasicrystals, which are comprised of bosons (i.e., subatomic particles that have spin in integer values, such as 0, 1, 2, and so on, and can occupy the same quantum state simultaneously).

Researchers at the Max Planck Institute for the Physics of Complex Systems (MPIPKS) recently introduced a new theoretical framework that describes low-energy excitations in bosonic quantum quasicrystals. Their newly devised theory, outlined in a paper published in Physical Review Letters, is an extension of conventional theories of elasticity, which also accounts for the unique symmetries of quantum quasicrystals.

“This paper is part of an ongoing collaboration with two colleagues, Prof. Francesco Piazza and Dr. Mariano Bonifacio, which began in 2022 when I was a guest scientist at MPIPKS in Dresden, Germany,” Alejandro Mendoza-Coto, first author of the paper, told Phys.org.

Karolinska Institutet researchers report that children born before 34 weeks of gestation show persistent deficits in cognitive abilities at ages 9 to 10. Impairments appear independent of socioeconomic status, genetic predisposition, and prenatal or child-specific risk factors. Lower scores were observed in vocabulary, working memory, episodic memory, and recall tasks. Children born late preterm (34–36 weeks) or early term (37–38 weeks) performed comparably to those born full term.

Preterm birth affects approximately 13 million infants worldwide each year and remains a leading cause of childhood morbidity and mortality. Although advances in perinatal care have increased survival, cognitive deficits in these children continue to present major public health concerns.

Critical brain development processes that occur between 24 and 40 weeks of gestation may be disrupted by premature birth. Prior research has mostly focused on extremely or very preterm infants, often overlooking those born moderately or late preterm, who constitute a large portion of preterm births.

The mammalian brain is known to produce mental representations of the spatial environment, known as cognitive maps, that help humans and animals navigate their surroundings. A subpopulation of neurons in the CA1 area of the hippocampus, which are referred to as place cells (PCs), have been found to become active when animals visit specific places or locations in their environment.

The activation of these cells was previously linked to the encoding of space-and goal-related information, which was predicted to support the creation of cognitive maps. While numerous past studies explored the function of PCs and their contribution to the creation of cognitive maps, the role of experience in shaping the creation of these maps has not yet been elucidated.

Researchers at Baylor College of Medicine recently shed new light on the mechanisms through which experience could influence the encoding of information by PCs. Their findings, published in Nature Neuroscience, suggest that experiences produce an adjustment of synaptic input in the mouse brain, which in turn affects the activity of PCs, enabling the production of flexible cognitive maps.

Found in everything from kitchen appliances to sustainable energy infrastructure, stainless steels are used extensively due to their excellent corrosion (rusting) resistance. They’re an important material in many industries, including manufacturing, transportation, oil and gas, nuclear power and chemical processing.

However, stainless steels can undergo a process called sensitization when subjected to a certain range of high temperatures—like during welding—and this substantially deteriorates their corrosion resistance. Left unchecked, corrosion can lead to cracking and structural failure.

“This is a major problem for stainless steels,” says Kumar Sridharan, a professor of nuclear engineering and engineering physics and materials science and engineering at the University of Wisconsin–Madison. “When stainless steel gets corroded, components need to be replaced or remediated. This is an expensive process and causes extended downtime in industry.”

Our lives are filled with binary decisions—choices between one of two alternatives. But what’s really happening inside our brains when we engage in this kind of decision making?

A University of Ottawa Faculty of Medicine-led study published in Nature Neuroscience sheds new light on these big questions, illuminating a general principle of neural processing in a mysterious region of the midbrain that is the very origin of our central serotonin (5-HT) system, a key part of the nervous system involved in a remarkable range of cognitive and behavioral functions.

“The current dominating model is that individual 5-HT neurons are acting independently from one another. While it had previously been suggested that 5-HT neurons may rather be connected with one another, it had not been directly demonstrated. That is what we did here. We also identify an intriguing processing role—or a computation—that is supported by this particular type of connectivity between 5-HT neurons,” says Dr. Jean-Claude Béïque, full professor in the Faculty’s Department of Cellular and Molecular Medicine and co-director of the uOttawa Brain and Mind Research Institute’s Centre for Neural Dynamics and Artificial Intelligence.

A rare cell type in the lungs is essential to survival from the COVID-19 virus, a new study shows.

Experiments in mice infected with the SARS-CoV-2 virus revealed that the immune cell class in question, called nerve and airway-associated interstitial macrophages, or NAMs, may keep the human immune system’s initial counterattack on the virus (lung inflammation) from spiraling out of control to endanger patients.

Macrophages are known to be the first responders to infection, as large immune cells capable of devouring invading viruses and the cells they infect.

Researchers from Sun Yat-sen University (SYSU) and the Institute of High Energy Physics (IHEP) have developed a novel top veto tracker system for the Taishan Antineutrino Observatory (TAO) experiment.

This system features a top veto tracker system with remarkable characteristics such as high light yield, distinct signal-background differentiation and high detection efficiency even at high thresholds, and provides the TAO experiment with a robust capability to suppress cosmic muon induced fast neutron and radioisotope events, which are significant correlated backgrounds for the neutrino signal. This scalable solution establishes a transferable technique for next-generation neutrino detectors requiring muon identification efficiency 99.5% across multi-ton volumes.

The findings are published in the journal Nuclear Science and Techniques.

A team of scientists used the popular video game Minecraft to explore how humans combine individual instincts with social cues when learning in complex environments.

By tracking players’ actions and visual focus in a simulated foraging task, they discovered that success depends not on using just one strategy, but on being flexible, adapting between solo exploration and social observation. This novel experiment bridges a long-standing gap between traditional studies and real-world learning, revealing that human intelligence thrives on adaptability, especially in uncertain environments.

The uniquely human edge: social learning across generations.