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כתבות אחרונות מאתר 'Phys'
Phys

Bow and arrow arrived about 1,400 years ago across western North America, study finds‎

A study clarifies the date of an important technological milestone: the adoption of the bow and arrow in western North America. The replacement of older weapons by bows and arrows occurred independently in several prehistoric cultures. Briggs Buchanan and colleagues explore this transition in western North America, where the bow replaced the atlatl and dart as the primary hunting technology. The study is published in PNAS Nexus.

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Phys

What's in your lipstick and water? New test flags hidden mutagens‎

Substances capable of mutating human genetic material—altering and permanently damaging it—are present in many everyday products. Researchers at Justus Liebig University Giessen (JLU) have, for the first time, detected mutagens and concurrently cytotoxic substances in food, meat, smoke flavorings, personal care products, and even water.

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Phys

'Conflict entrepreneurs': Examining divisive political rhetoric and the pursuit of celebrity by politicians‎

American politics is increasingly characterized by high levels of polarization and divisive rhetoric, despite stated preferences among voters for civility and substantive debate. Sean J. Westwood and colleagues sought to understand what might incentivize a politician to use divisive rhetoric by analyzing 2.2 million public statements from the 118th U.S. Congress. The study is published in PNAS Nexus.

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Phys

Quantum-inspired laser system delivers distance measurements with sub-millimeter accuracy‎

A new laser range-finding technique, inspired by quantum physics, that can measure distances under strong solar background has been demonstrated by researchers at the University of Bristol. The team has proved their hypothesis by testing out their new method on some of the university's most iconic buildings.

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Phys

'Rock clock' refines time measurement of Earth's early complex animal life‎

How can we measure time more than 500 million years into the past? A study recently published in Nature Communications by researchers at the University of Lausanne presents a new geological "rock clock" that allows major climate events from the dawn of complex animal life to be dated with unprecedented precision.

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Phys

Climate policies can reduce emissions from economic growth in wealthy nations‎

Scientists have debated for decades whether economies can continue to grow without increasing greenhouse gas emissions. A new study by a Penn State researcher has found that this may be possible, but only under strict conditions and mostly for the world's wealthiest nations. The work includes the analysis of more than three decades of data from nations using the international Organisation for Economic Co-operation and Development's Climate Actions and Policies Measurement Framework (CAPMF) database, which does not include the United States, to examine how climate policies affect the link between economic growth and greenhouse gas emissions.

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Phys

AI model improves flood forecasting with higher accuracy than current methods‎

New paired studies from the University of Minnesota Twin Cities show that machine learning can improve the prediction of floods. The studies, published in Water Resources Research and the Proceedings of the IEEE International Conference on Data Mining, demonstrate how "knowledge-guided" artificial intelligence can assist forecasters in saving lives and protecting infrastructure as the frequency of extreme weather increases.

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Phys

The cost of cold: Economics research links frozen crops to domestic violence‎

In December 2023, the Peruvian Andes were hit by a severe drought followed by a wave of nighttime freezing temperatures. The "cold shock" didn't just wither crops and cause widespread hunger; it reached deep into the homes of the families who live there.

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Phys

Physicists trace the sun's magnetic engine, 200,000 kilometers below its surface‎

Every eleven years, the sun's magnetic field flips. Sunspots—dark, cooler regions on the sun's surface that mark intense magnetic activity and often trigger solar eruptions—appear at mid-latitudes and migrate toward the star's equator in a butterfly-shape pattern before fading as the cycle resets. While this spectacle on the star's surface has long been visible to astronomers, where this powerful cycle begins inside the star has remained hidden until now.

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Phys

Why some people still believe that aliens shaped ancient civilizations‎

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself?

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