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כתבות אחרונות מאתר 'Phys'
Phys

Forest productivity, not rapid warming, shapes Northern Eurasia's carbon sink‎

Northern Eurasia contains about 20% of the world's forests and plays a crucial role in mitigating climate change by absorbing atmospheric carbon dioxide, thereby acting as a major carbon sink. However, understanding the region's carbon sink is challenging because it is influenced by multiple interacting factors, including rapid climate change, wildfires, land-use change and limited observational coverage across its vast extent.

00:24
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Phys

Twisted laser light distinguishes mirror-image molecules by their fragment counts‎

Many molecules exist in two mirror-image forms—like left and right hands—that look identical but can behave very differently, especially in biological systems and pharmaceuticals. Distinguishing between these enantiomers (also called chiral molecules) is a longstanding challenge in science and technology. A useful analogy is that of a screw and a nut: A right-handed screw fits only into a right-handed thread, while a left-handed one will not engage properly.

22:13
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Phys

When a teenager makes the 'stupid choice,' their brain is working exactly as designed‎

When an adult refuses to let an injustice pass—stands up to a bully or asserts their rights—we call it principle. When a 15-year-old retaliates to an insult thrown in a school corridor, risking detention, we call it a failure to think ahead. It's easy to ascribe this to a not-yet-developed teenage brain: a convenient shorthand for assuming they simply cannot weigh consequences properly.

21:05
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Phys

Gamma-ray pulsations reveal extreme 3.2-millisecond pulsar 3,900 light-years away‎

By analyzing the data from NASA's Fermi gamma-ray space telescope, Chinese astronomers have investigated a recently identified millisecond pulsar known as PSR J0435+3233. As a result, they found that the pulsar exhibits gamma-ray pulsations. The discovery was detailed in a paper published July 17 on the pre-print server arXiv.

21:05
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Phys

Trace molecules emerge as chemical 'keystones' that steer life's communities‎

In nature, the rarest ingredient can be the one that holds everything together. In a new article published in Trends in Ecology & Evolution, Dr. Erika C. Freeman of the Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) in Berlin argues that a handful of scarce molecules can shape entire living communities, far out of proportion to how little is present. These are what ecologists call "keystone molecules."

20:04
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Phys

A quantum heat engine that simultaneously provides work and refrigeration‎

The laws of thermodynamics state that heat naturally flows from hotter systems or regions to colder systems or regions until a state of thermal equilibrium is reached. This simple principle underpins the operation of numerous technologies, ranging from refrigerators to power plants.

19:33
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Phys

DNA vacuum captures animal traces from air to map Danish wildlife‎

Researchers have developed a DNA vacuum that can suck genetic traces from animals out of the air and reveal which animals live in an area. In two new studies, the researchers collected air samples in three natural areas in Denmark and showed that the method can be used to map local wildlife. This brings them a major step closer to better monitoring biodiversity using DNA from the air.

17:33
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Phys

Angola's oldest burials, including its only known ancient cremation, uncovered at a 15th-century site doomed by a dam‎

As the construction of a hydroelectric dam loomed, archaeologists raced to uncover Angola's earliest dated burials and its only known cremation at a 15th-century settlement before it vanished beneath the water.

16:14
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