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כתבות אחרונות מאתר 'Phys'
Phys

Mercury scout mission concept with solar sail propulsion‎

The planet Mercury is the closest planet to the sun, and also the most difficult for spacecraft to visit and explore. This is because as spacecraft get closer to Mercury, the sun's enormous gravity pulls in the spacecraft, greatly increasing its speed and making it hard to slow down without large amounts of fuel. But what if a spacecraft could both travel to and explore Mercury without fuel? This could drastically reduce mission costs while delivering impactful science.

04:06
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Phys

Researchers warn of risks posed by 'contaminants of emerging concern' found in crops, agricultural soil‎

A new international study offers insights into the health risks posed by crops' absorption of "contaminants of emerging concern" (CECs) and flags knowledge gaps the authors say must be addressed. CECs include pharmaceuticals, microplastics, engineered nanomaterials and PFAS (commonly known as "forever chemicals"). The researchers warn that even when present at very low concentrations, these chemicals can subtly alter plant physiology, disrupt soil health and pose wider environmental and human health risks.

03:35
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Phys

Study suggests people are losing 338 spoken words every year and have been for at least 15 years‎

In a society increasingly shaped by self-checkouts, GPS navigation and touchscreen ordering kiosks, new research shows face-to-face conversation may be quietly fading. A new study published in Perspectives on Psychological Science suggests that people are losing 338 spoken words every year and have been for at least a decade and a half.

02:57
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Phys

Researchers present first fossilized 'emperor' butterfly‎

Butterfly fossils are rare, and finds that preserve fine anatomical details and wing patterns are an absolute exception. An international research team from Sweden, the U.S., and Germany, led by Dr. Hossein Rajaei, lepidopterist at the State Museum of Natural History Stuttgart, and with the participation of Prof. Dr. Torsten Wappler from the Hessian State Museum Darmstadt, has now described an exceptionally well-preserved butterfly fossil, approximately 34 to 28 million years old.

02:47
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Phys

Thirty previously unpublished verses by Empedocles discovered on a papyrus from Cairo‎

A 2,000-year-old papyrus fragment, discovered in the archives of the French Institute of Oriental Archaeology in Cairo, reveals 30 previously unpublished verses by Empedocles, a pre-Socratic philosopher of the fifth century BCE. This discovery offers researchers direct access to a body of thought previously known only through quotations from later authors. The very first edition, translation, and commentary on these verses are published in the book "L'Empédocle du Caire," edited by Nathan Carlig, Alain Martin, and Olivier Primavesi.

02:38
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Phys

Reducing aircraft soot might not actually reduce the climate effects of contrails‎

Reducing aircraft soot emissions may not reduce contrail clouds, according to in-flight observations of emissions from a passenger jet with modern "lean-burn" engines, reported in Nature. Contrails from aircraft contribute to the climate-warming impacts of aviation. The findings demonstrate that more work is needed to understand and reduce the climate impact of jet engine emissions.

02:22
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Phys

World's largest quantum circuit simulation for quantum chemistry achieved on 1,024 GPUs‎

A joint research team between the Center for Quantum Information and Quantum Biology (QIQB) at The University of Osaka and Fixstars Corporation has demonstrated one of the world's largest classical simulations of iterative quantum phase estimation (IQPE) circuits for quantum chemistry on up to 1,024 GPUs, surpassing the previous 40-qubit limit. The result expands the scale of molecular systems available for the development and validation of quantum algorithms for future fault-tolerant quantum computers, supporting progress toward industrial applications in drug discovery and materials development.

02:16
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Phys

Lakes forming next to Greenland's melting ice sheet are speeding up glacier flow‎

A growing network of meltwater lakes at the edge of the Greenland ice sheet is accelerating the flow of major glaciers, potentially increasing the pace of global sea-level rise. Warmer air and sea temperatures have led to the loss of around 264 gigatons of ice every year in Greenland since 2002, causing sea levels to rise by 0.8 millimeters annually. But a new study by the University of Leeds examining glacier behavior across the entire ice sheet has highlighted a lesser-known feature that is amplifying this mass loss—the freshwater lakes forming as the ice retreats.

02:06
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Phys

Oregano, rosemary and 'time': Long-term swine study shows natural-compound benefits‎

In the search to replace antibiotic growth promoters with effective alternatives in modern swine production, plant-based essential oils are showing potential to provide lasting benefits. In a rare long-term public study that compared the effects of phytochemicals from rosemary and oregano with antibiotic growth promoters, animal scientists with the Arkansas Agricultural Experiment Station found that the natural agents given to weaned pigs supported favorable gut health and growth performance later in their lives by preserving microbial diversity to improve nutrient utilization.

02:06
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Phys

Stretching metals can tune catalysis: A new method predicts energy shifts‎

Heterogeneous catalysis—in which catalysts and reactants are of different phases, e.g., solid and gas—is important to many industrial processes and often involves solid metal as the catalyst. Ammonia synthesis, catalytic converters for automobile exhaust, methanol synthesis, carbon dioxide reduction, and hydrogen production are examples of such metal-catalyzed heterogeneous catalysis.

01:51
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