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Study reports the first detection of a sugar in interstellar space

Sugars are key biomolecules in living organisms, as they form the backbone of DNA and RNA and play a fundamental role in metabolic processes. In theories of the origin of life, sugars are also essential for the synthesis of the first nucleic acids. Despite their importance, one of the major questions in origin-of-life research is how the first sugars formed on Earth, since laboratory experiments show that they do not form in sufficient quantities under prebiotic conditions.

Sugars such as ribose and glucose have previously been detected in meteorite and asteroid samples, suggesting that some of these molecules may have originated in the primordial molecular cloud from which our solar system formed. However, until now, no sugar had ever been directly detected in the interstellar medium.

Firefly brightness holds a cautionary tale about accepting older measurements

For over a century, the accepted value for a firefly’s brightness has mostly stood, tracing its origins to experiments carried out in 1912. Through rigorous new analysis published in the American Journal of Physics, David Silver of Remiza AI in New York has discovered that this value has likely been vastly overestimated. His results provide a stark reminder of what can happen when widely accepted older measurements are converted into modern standard units.

Out of the hundreds of species of animals, fungi and bacteria that produce their own light, fireflies are the most widely studied. In the 1880s, experiments revealed that their flashing bioluminescence emerges from a catalyzed reaction between an organic compound named luciferin and an enzyme named luciferase.

In 1912, the brightness of these flashes was measured for the first time by William Coblentz—one of the founders of modern radiometry. “Coblentz reported that the flash of the firefly Photinus pyralis ranged from 1/50th to 1/400th the power of a candle, with 1/400 predominating,” Silver describes.

AI-powered electronic nose can distinguish tens of thousands of odors

A research team has presented a roadmap for developing an “artificial olfactory system” that detects odors like the human nose and analyzes them using artificial intelligence (AI) by leveraging metal-organic frameworks (MOFs). The team systematically organized and reviewed key research trends in electronic nose technology, from MOF material design to sensor implementation and AI-based odor pattern recognition. The research was led by Hyuk-Jun Kwon’s in the Department of Electrical Engineering & Computer Science of Daegu Gyeongbuk Institute of Science and Technology. The work is published in the journal Progress in Materials Science.

An artificial olfactory system, or “electronic nose (e-nose),” is a technology in which AI learns and analyzes signal patterns generated when multiple sensors respond to odor molecules. Although it has broad potential applications in areas such as food safety, environmental pollution monitoring, hazardous gas detection and disease diagnosis, conventional sensor materials have faced limitations in selectivity, response speed and operating conditions.

The research team focused on MOFs as a key material for overcoming these limitations. MOFs are porous materials formed by combining metal ions and organic compounds, and they can effectively adsorb odor molecules through their microscopic pores. Moreover, because their structures and chemical properties can be tailored for specific purposes, they are regarded as next-generation sensor materials capable of sensitively detecting various odors even under room-temperature, low-power operating conditions.

New 3D thermal cloak hides objects from heat in any direction

Researchers have designed and built the first 3D device that can make objects invisible to heat, an advance that could transform how we protect sensitive electronics, manage heat in microchips and shield equipment from thermal detection.

The new thermal cloak can hide objects of almost any shape from infrared cameras while also protecting them from extreme temperatures. Unlike previous designs, which worked only in two dimensions or from a single direction, the cloak works from essentially any direction. Rather than simply blocking heat, thermal cloaking guides heat around an object so that, to an infrared camera, it appears as if nothing is there.

University of Illinois Urbana-Champaign civil and environmental engineering professor Shelly Zhang, postdoctoral researcher Weichen Li and graduate student Yibo Wang collaborated with professor Ole Sigmund at the Technical University of Denmark on the study, which was published in the journal Nature Communications.

‘Silly sprinklers’ put in reverse to further unravel decades-old physics puzzle

Each summer, lawns are marked by a familiar addition: “silly sprinklers,” whose loops and spirals spew water in creative ways. While seemingly frivolous in their construction, a team of mathematicians has used their design to address a long-standing mystery surrounding the laws of physics.

For decades, scientists have been trying to solve Feynman’s Sprinkler Problem: How does a sprinkler running in reverse—in which the water flows into the device rather than out of it—work? Through a series of experiments on custom-designed sprinklers with different shapes, the researchers arrived at a clear answer and, more generally, determined how flowing fluids exert forces and move structures.

“This work provides the experimental answer for Feynman’s Sprinkler Problem by showing, across several sprinkler types, how the angular momentum of water flows drives sprinklers’ rotation,” explains Leif Ristroph, an associate professor at New York University’s Courant Institute School of Mathematics, Computing, and Data Science and the senior author of the paper, which appears in the journal Proceedings of the National Academy of Sciences.

Social media likes may have a bigger influence on people with depression

One of the first things many people do after posting on social media is check how many likes they have and who has liked their content. This habit can be an instant mood booster when a post is popular.

People who are depressed may also show a stronger behavioral response to receiving likes, according to a new study published in the journal JAMA Psychiatry. Researchers discovered that the more likes their posts received in one day, the more likely they were to post the following day. This runs contrary to previous studies that suggested individuals with depression are less responsive to positive feedback.

Hidden fifth dimension could tune dark matter resonance, new theory proposes

The mysterious substance that binds galaxies together could naturally be “in tune” with a hidden fifth dimension, according to a new University of Sheffield theory aiming to shed light on one of science’s biggest enigmas: dark matter.

Dark matter has been explored by scientists and science fiction writers for decades, inspiring everything from planet-destroying vortexes in “Star Trek” to the “dust” that sustains the multiverse in Philip Pullman’s “His Dark Materials” fantasy trilogy.

Yet it remains one of the greatest open problems in physics. While scientists are certain it exists because of its immense gravitational effect—acting as an invisible “cosmic glue” holding galaxies together—it has never been observed, and its true nature remains a mystery.

Atoms tell different stories when light hits a molecule in trillionths of a second

Researchers have captured how a molecule redistributes energy after absorbing light, differentiating the roles of individual atoms in the process. They used X-ray flashes from the European XFEL to show that different atoms in the same molecule can reveal different aspects of the process. The study provides evidence that excitation by light can enhance an atom’s sensitivity to the motion of nearby atoms. The new method for following ultrafast chemical reactions at the atomic scale, in real time, can help researchers understand photostability in DNA, energy flow in light-harvesting materials and other fundamental processes driven by light.

The team investigated 3-fluoropyridine, a small ring-shaped molecule. When the molecule absorbs light, such as a short pulse from an ultraviolet laser, it is promoted into an electronically excited state and rapidly distorts out of its original planar shape. It then passes through a so-called conical intersection: a short-lived but crucial crossing point where movements of electrons and the atoms’ cores become strongly coupled.

After this point, the molecule returns to the ground state. At that moment, electronic energy is converted into vibrations. The researchers found that this conversion leaves distinct fingerprints at different atomic sites: the fluorine atom acts as a clean marker of vibrational relaxation, while the nitrogen atom, which is more directly involved in the excitation, reflects an intertwined response of electron redistribution and structural motion.

Scientists and citizens are more persuasive than government and industry in mobilizing action, study finds

In environmental, health and technology crises, Americans are more persuaded to take action by scientists and public consensus than by leaders in government and industry, according to a study in the Proceedings of the National Academy of Sciences by researchers at Boston College and Princeton University.

Across four studies involving roughly 55,000 individuals, Americans revealed they were especially influenced when both scientists and ordinary citizens supported a solution, said Boston College Assistant Professor of Psychology and Neuroscience Gregg Sparkman, senior author of the study.

“What surprised us was how consistently the combined voice of scientists and ordinary citizens mattered across issues and partisans, even when governments and companies opposed action,” said Sparkman. “Americans were still encouraged to act when scientists and ordinary citizens jointly expressed support for solutions.”

Metals’ atomic arrangement can create ‘corrosion highways’ in nuclear reactors

Nuclear reactors are traditionally powered with dense fuel rods that can produce about 1 gigawatt of carbon-free electricity, enough to power about 100,000,000 lightbulbs. Newer power plant designs using molten salt for cooling instead of the water found in traditional reactors could offer better efficiency and stability, but they face a problem—the extreme chemical environment created by the molten salt can corrode the metal comprising the reactor.

A team led by engineers at Penn State found that adjusting the subtle atomic arrangement of structural metals can significantly affect the rate and extent of this corrosion, even with identical baseline chemical compositions. They did this by creating a series of reactive simulations to isolate and study this corrosion mechanism. Their findings are available online ahead of publication in the August issue of Corrosion Science.

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