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כתבות אחרונות מאתר 'Phys'
Phys

Interpretable AI in materials discovery: Uncovering how models make predictions‎

A method to interpret artificial intelligence (AI) models used in materials discovery by analyzing their learned features has been developed by researchers from Japan. The method extracts key features from an AI model trained on atomic structural data and optical absorption spectra, and then groups materials with similar structural and spectral characteristics. This approach can be extended to reveal how atomic arrangements influence other material properties, paving the way for more efficient materials design.

04:36
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Phys

The extraordinary physiological challenges facing amputee John McFall in space‎

The UK Space Agency has announced an agreement with Vast—a US commercial space company—that could send British astronaut John McFall into orbit as early as 2027. If the mission goes ahead, he would become the first person with a physical disability to live and work in space.

03:48
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Phys

Astrochemical model digs into the universe's missing sulfur‎

Sulfur is one of the most abundant elements in the universe. If you peer into a diffuse interstellar cloud, you find loads of it—about the amount expected based on fusion patterns in the stars it was born in. However, if you look at a dense, cold molecular cloud—the kind where those stars actually form—it seems like 99% of the sulfur expected to be there is missing. Scientists have puzzled over this "missing sulfur problem" for decades, though a leading theory is that the element hides in icy dust grains, making it hard to detect.

02:44
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Phys

How the invention of glassblowing changed everyday life in ancient Rome‎

We see glass objects every day and often don't think much about them. Mass-produced glass has become so cheap we barely think about the things it allows us to do.

01:31
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Phys

When less is more: Scaling law explains why ultrathin materials get stronger as they get thinner‎

One of the most fascinating aspects of physics is that nature often behaves in ways that seem completely counterintuitive. A good example comes from ultrathin materials. If I take a sheet of material and make it thinner and thinner, most people would expect it to become weaker. After all, there is less material left to bear a load.

01:02
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Phys

New tool to help build more reliable DNA nanostructures‎

Scaffolded DNA and RNA origami is a technique that allows scientists to build tiny, highly precise two- and three-dimensional objects. Because these nanostructures can interact naturally with biological systems, they could have important future uses in health care and agritech.

00:14
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Phys

Black Lives Matter movement changed workplace cooperation between Black and white employees, research shows‎

The increased public attention on racial injustice after the murder of George Floyd influenced how Black and white employees interacted at work, new University of Washington research suggests. The study, recently published in the Academy of Management Journal, examines how major societal events tied to race and injustice can shape workplace behavior. Researchers specifically investigated how the heightened salience of the Black Lives Matter (BLM) movement impacted cooperation between Black and white coworkers.

00:14
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Phys

Hydrogen-based steelmaking gets 2x boost from nickel oxide catalyst, study finds‎

Steel and metal production are among the largest contributors to global greenhouse gas emissions, accounting for approximately 10% of global CO2 emissions. At the same time, modern technology relies on tailored steels and metals for applications in fields such as mobility, energy, infrastructure, safety and medicine. Hydrogen-based metal production offers a promising CO2-free alternative and goes even further by integrating reduction, alloying and microstructure design into a single production step. However, hydrogen-based metal production still faces a number of challenges on its path to widespread adoption, one of which is the relatively slow reduction kinetics of metal ores at temperatures below 800°C (1,472°F).

23:16
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Phys

NASA's proposed Early eVolution Explorer mission aims to solve the radius valley mystery‎

A debate has been raging among planetary scientists for more than a decade—why are there so few exoplanets with a radius of about 1.8 times that of Earth? Exoplanets are currently largely grouped into two distinct categories—"super-Earths" are below that size and have rocky interiors, whereas "sub-Neptunes" are above that size limit and appear puffier. But researchers don't really understand why the path of planetary evolution forces this bifurcation. A new mission proposal, called the Early eVolution Explorer (EVE), wants to find out, and a draft of its concept can be found in preprint form on arXiv.

22:42
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Phys

Manakins' dazzling dances may owe their origins to an ancient diet shift‎

Few animals put on a show quite like manakins. In the rainforests of Central and South America, males of these small tropical birds, with strikingly bright plumage, often gather at communal display sites (leks), where they clear their own dance courts and spend much of their lives performing high-speed backflips, snapping their wings like firecrackers, and running through choreographed routines with other males, all to attract a mate.

22:11
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