Phys.org

知识

1榜单15天前更新默认榜单
实时热榜
Phys.org
15天前更新
  • 01
    As urban tree shade shrinks, mortality rises
    As trees disappear from urban neighborhoods, lives may be lost with them. In a new study, Northwestern University scientists tracked death rates and fluctuations in tree canopy cover across an 11-year period in Chicago. They found that areas experiencing greater losses in tree canopy—land covered by trees' leafy crowns—also experienced higher mortality rates, particularly in the city's hottest neighborhoods.
  • 02
    Why being born helpless may be one of humanity's greatest strengths
    Babies start out life helpless and stay that way for a long time. They cannot walk, feed themselves or survive without an adult's continued care. Our dependency timeline has no clear parallel elsewhere in the animal kingdom.
  • 03
    Scattered Roman bones point to potential fourth-century purge at Brading Villa
    Disarticulated bones found scattered across a luxurious Roman villa on England's Isle of Wight may be evidence of a massacre carried out during a brutal political purge in the fourth century, a new study in Britannia suggests.
  • 04
    SpaceX aims to use rockets to quickly transport cargo across the Earth and into orbit
    You might think of rockets as powerful vehicles that blast astronaut crews and robotic missions into space. But what if they could be used to send cargo from one side of Earth to the other in a fraction of the time it would take a plane? The company SpaceX recently announced a project that aims to use its rockets to do just that.
  • 05
    Climate change may be making us lonelier: How heat waves and extreme weather disrupt social connections
    Severe storms, heat waves and wildfires can shut down the social life of a community, flooding out festivals, canceling community events and keeping people indoors.
  • 06
    Cell-inspired synthetic fibers reveal a reversible route to self-protecting smart materials
    Researchers at the University of Bayreuth, together with colleagues from Freie Universität Berlin and the Leibniz Institute of Polymer Research Dresden, have developed a synthetic fiber system inspired by the cellular cytoskeleton that protects itself through controlled bundling. The findings open up new avenues for smart, switchable materials whose properties can be deliberately altered in response to a specific stimulus. The research is published in the journal Advanced Materials.
  • 07
    Restoring the silenced Friedreich's ataxia gene through unconventional means
    Cells can switch off genes by tightly packaging DNA around proteins called histones. However, scientists at St. Jude Children's Research Hospital have discovered that under certain conditions, this packaging acts more like molasses than a solid, allowing a specially designed chemical adapter to shuttle gene-activating proteins through the packaging to the silenced gene inside. In addition, the researchers showed that this process reactivates the gene frataxin, which is abnormally silenced in the
  • 08
    Is hemp a thirsty crop? New research measures just how much water cannabis farming can use
    In South Africa, it's been legal for several years for people to grow hemp (a type of Cannabis sativa with very low levels of the psychoactive compound THC) for personal use following changes to the law. There's also been a growing interest in its medicinal and industrial potential for clothing, insulation and paper production. Many see it as a "green gold" opportunity for small-scale farmers.
  • 09
    Study finds strong link between conspiracy beliefs, antisemitism and anti-Israel attitudes
    New research from Rutgers University–Newark psychologist Kent Harber reveals a strong connection between conspiracy theories, antisemitic attitudes and hostility toward Israel.
  • 10
    New molecule class creates hardy, drought tolerant plants
    As climate change causes water scarcity and temperatures to rise, crops around the world are feeling the heat. How can we prevent severe crop losses in these relentlessly sweltering conditions? An international research team led by Tohoku University has identified a new class of small molecules that enhances plant drought tolerance without any major negative impact on plant growth.
  • 11
    Social media can shape your travel plans, according to study
    New University of Georgia research suggests that social media could influence people's travel plans. The paper is published in the journal Current Issues in Tourism.
  • 12
    Astronomers catch massive star's death from the first explosive moment
    In March 2026, the Einstein Probe detected a brief flash of soft X-rays emitted from a galaxy about 500 million light-years away. The flash, dubbed EP260321a, immediately triggered a worldwide observing campaign. Within an hour, ground-based telescopes began monitoring the source, revealing a rapidly brightening supernova, later designated SN 2026gzf. Two teams of scientists used several NSF NOIRLab facilities to observe the event and monitor its evolving light profile.
  • 13
    SpaceX rocket stage believed to have slammed into the moon
    A piece of a SpaceX rocket weighing four tonnes (4.4 tons) was believed to have unintentionally crashed into the moon on Wednesday, a collision that posed no danger to Earth but is expected to leave behind a lunar crater.
  • 14
    Gene-edited beagles may offer a future option for people with dog allergies
    Matt Walker couldn't pet a dog without sneezing—until he and other scientists used a gene editing technique to produce a hypoallergenic beagle named Bailey.
  • 15
    Human activity more than doubles Arctic fire occurrence, satellite analysis suggests
    Fires in the Arctic are not solely a regional issue, as shown by the hazy skies in Switzerland last summer despite otherwise sunny weather. Smoke from major fires in northern Canada crossed the Atlantic and reached Europe. Until now, large-scale studies of Arctic tundra fires have focused primarily on rising temperatures and drought as the main drivers. The role of human activity has received much less attention, even as industrial development, settlements, roads and other infrastructure expand
  • 16
    Avalanche cracks may appear globally supersonic while remaining locally subsonic
    Can a crack be supersonic? Can the fracture that triggers an avalanche propagate faster than the limiting velocity predicted by classical fracture mechanics? The question remains the subject of debate within the scientific community. While some numerical and experimental studies suggest that avalanche cracks may propagate at supersonic speeds, others offer a different interpretation.
  • 17
    Pumas make roads safer for drivers by changing prey behavior patterns
    Living among large predatory carnivores could actually make you safer. A study published in the journal Current Biology found that pumas—wild cats also known as mountain lions, cougars or panthers—change deer behavior, leading to fewer collisions with cars on roadways. In areas where puma occupancy is high, the authors report a significant reduction in the total expected number of collisions over a 5-year period.
  • 18
    Turning one of the world's most difficult plastics into premium lubricant
    Virginia Tech chemist and chemical engineer Guoliang "Greg" Liu and his lab have developed a process that converts the plastic polyvinyl chloride (PVC) into polyalphaolefin, a key component in lubricants such as engine oil. Published Aug. 5 in the journal Nature, the research could help address two environmental challenges: recycling one of the world's most difficult plastics and producing a valuable industrial material.
  • 19
    Tiny vortices discovered on the sun's surface
    Researchers from the U.S. National Science Foundation National Solar Observatory (NSF NSO), the Max Planck Institute for Solar System Research (MPS) in Germany, and the High Altitude Observatory (HAO) in the U.S. have made a discovery in solar physics. New images of the sun's surface taken with the world's largest solar telescope, the NSF Daniel K. Inouye Solar Telescope, built and operated by the NSO in Hawaii, along with sophisticated computer simulations, reveal tiny plasma vortices that had
  • 20
    Act now on microplastic risks, businesses urged
    A new white paper released by experts at the UTS Business School highlights the risks businesses face if they ignore growing scientific evidence and consumer awareness of the dangers posed by microplastics.
  • 21
    Backpack lab finds wastewater contamination and drug-resistant bacteria in Galápagos waters
    From routine surgeries to cancer treatment, modern medicine depends on drugs that can fight infections caused by microbes such as bacteria, viruses, fungi and parasites. But some microbes are becoming resistant to the drugs used to treat them, which has wide-reaching consequences for global public health.
  • 22
    Ancient armored fish that narrowly avoided meteorite strike reveals life before Earth's largest mass extinction
    A rare fossil discovered near South America's largest known meteorite crater has been named a new species. Initially mistaken for a frog by locals, Leolepis matogrossensis is actually a species of ancient ray-finned fish—the group that includes 96% of all bony fishes living today, including tuna, salmon and cod. It's a fairly primitive member of the group and lived around 254 million years ago.
  • 23
    Noisy bubbles hinder ultrasound-boosted chemical reactions, sonochemistry model shows
    Ultrasound is a powerful way to drive chemical reactions. When high-frequency sound waves pass through a liquid, tiny bubbles form and then violently collapse in a process called acoustic cavitation. During this collapse, gas particles are forced together, creating temperatures inside the bubbles that can exceed 5,000 K—hotter than the surface of the sun—and driving chemical reactions.
  • 24
    Soilless farming system design can determine microbial growth, impact on crops
    Soilless farming—a method of growing plants in a nutrient-rich solution rather than traditional soil—accounts for a significant share of vegetable production, according to the U.S. Department of Agriculture (USDA), with more than half of tomatoes, cucumbers and lettuce grown using hydroponics. This fast-growing segment of modern agriculture addresses water scarcity, land limitations and food security, but microbial management remains a challenge, according to a team of researchers at Penn State.
  • 25
    Were there tiny dinosaurs? New study explores one of evolution's biggest mysteries
    Dinosaurs are famous for being big, from the towering Tyrannosaurus rex to the colossal Apatosaurus. But a new study published today in the journal Evolution by scientists at the American Museum of Natural History and Princeton University suggests that one of the greatest mysteries of dinosaur evolution isn't how some species became giants—it's why even the smallest dinosaurs never became truly tiny.
  • 26
    A new take on interpreting chemical bond analysis in solids
    Researchers from Skoltech, SberUniversity, the M.N. Mikheev Institute of Metal Physics of UB RAS and Ural Federal University have published a review of a novel approach to interpreting chemical bonding in solids. The method not only describes crystals in terms of precise calculations but also enables chemists to reclaim explanatory models that are intuitively meaningful to them. The insights that emerge span long-documented anomalies that previously lacked a theoretical account.
  • 27
    Study finds climate-driven greening is reshaping East Asia's air pollution
    The effects of climate change extend far beyond rising temperatures. As forests and other vegetation respond to a warming world, they also change the amount of biogenic emissions released into the atmosphere, influencing the formation of ozone (O3) and fine particulate pollution. Yet many atmospheric chemistry models still estimate these emissions using vegetation data from 2003, despite major ecological changes across East Asia over the past two decades.
  • 28
    Study suggests natural sounds help us feel more attached to specific places
    A new study suggests the sounds around us have a significant impact on how we feel about physical spaces, with natural sounds—such as birdsong—associated with a greater sense of attachment to a given place. The study draws on data from a large-scale participatory science project involving more than 1,000 citizen scientists.
  • 29
    Ways to help protect Australia's birds and mammals from bird flu
    The deadly H5N1 strain of bird flu has now spread from migratory birds to infect resident Australian birds. Clusters of dead birds have been found in several locations. The virus will inevitably infect other wildlife, most notably mammals.
  • 30
    Bird flu decimated South America's marine mammals. What can Australia do differently?
    Australia is now confronting an outbreak of a deadly bird flu strain. As of Monday, the highly pathogenic H5N1 virus had been detected in 78 wild birds across mainland Australia. Until now, there had been no evidence of a large-scale outbreak.