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271,492 articles from PhysOrg

Following in polar bears' footprints: DNA from snow tracks could help monitor threatened animals

Polar bears are icons of the Arctic, elusive and vulnerable. Detailed monitoring of their populations is crucial for their conservation—but because polar bears are so difficult to find, we are missing critical data about population size and how well-connected those populations are. Scientists have now developed a new tool to help: DNA analysis using skin cells shed in the bears' footprints in...

Teaching physics from the din of flying discs

Disc golf is booming, with record numbers of players turning up each year to partake in the disc-throwing sport. It is also whizzing and whistling. In fact, the sound a disc makes while soaring through the air toward its target is full of information about how fast the disc is flying and how quickly it spins.


Bottlenose dolphins can sense electric fields, study shows

A small team of bio-scientists from the University of Rostock's Institute for Biosciences and Nuremberg Zoo's Behavioral Ecology and Conservation Lab, both in Germany, has found evidence that bottlenose dolphins can sense electric fields. In their study, reported in the Journal of Experimental Biology, the group tested the ability of two captive bottlenose dolphins to sense a small electric field.


As seas get warmer, tropical species are moving further from the equator

Climate change is causing tropical species in the ocean to move from the equator towards the poles, while temperate species recede. This mass movement of marine life, termed tropicalization, is leading to a cascade of consequences for ecosystems and biodiversity, and has the potential to impact the global economy.

A new possible explanation for the Hubble tension

The universe is expanding. How fast it does so is described by the so-called Hubble-Lemaitre constant. But there is a dispute about how big this constant actually is: Different measurement methods provide contradictory values.


Social media influencers may affect more than voter opinions

If Thanksgiving dinner conversations have turned into heated political arguments over the past two decades, social media may be to blame. Popular social media figures—or influencers—who create or share distorted political messages may cause political parties to moderate their policies to win over independent voters in general elections but tend to polarize the rest of society, according to...

Shrinking particle accelerators with cold plasma and a large picnic basket

Twenty-five feet below ground, SLAC National Accelerator Laboratory scientist Spencer Gessner opens a large metal picnic basket. This is not your typical picnic basket filled with cheese, bread and fruit—it contains screws, bolts, steel tubing, and many other parts and pieces that carry particles to nearly the speed of light. The components are arranged precisely to do an important job: help...

Scientists navigate uncharted waters in fish immunology research

Upon infection or immunization, all jawed vertebrate species generate proteins called antibodies that bind and neutralize pathogens. Strong and long-lasting antibody responses in warm-blooded species such as mammals are produced in secondary lymphoid microstructures (SLMs) among which germinal centers (GCs) are the centerpiece.

New understanding of 'oobleck-like' fluids contributes to smart material design

If you mix cornstarch and water in the right proportions, you get something that seems not-quite-liquid but also not-quite-solid. Oobleck flows and settles like a liquid when untouched but stiffens when you try to pick it up or stir it with a spoon. The properties of oobleck and other non-Newtonian fluids—including Silly Putty, quicksand, paint, and yogurt—change under stress or pressure, and...

Flexible parental leave among immigrant mothers can promote integration

Mothers who took parental leave part-time or for shorter periods were more likely to engage in income-generating activities or pursue education. A new study uncovers surprising patterns in parental leave usage among newly arrived migrant women in Sweden, specifically focusing on their integration into the labor market.

Vera Rubin telescope will generate a mind-boggling amount of data, say astronomers

When the Vera C. Rubin Observatory comes online in 2025, it will be one of the most powerful tools available to astronomers, capturing huge portions of the sky every night with its 8.4-meter mirror and 3.2-gigapixel camera. Each image will be analyzed within 60 seconds, alerting astronomers to transient events like supernovae. An incredible 5 petabytes (5,000 terabytes) of new raw images will be...

Researcher develops a chatbot with an expertise in nanomaterials

A researcher has just finished writing a scientific paper. She knows her work could benefit from another perspective. Did she overlook something? Or perhaps there's an application of her research she hadn't thought of. A second set of eyes would be great, but even the friendliest of collaborators might not be able to spare the time to read all the required background publications to catch up.

Europe is working on a multi-purpose habitat for the moon

With NASA gearing up to send humans back to the moon in the next few years with the Artemis missions with the goal of establishing a permanent outpost at the lunar south pole, nations are making efforts to contribute to Artemis and a permanent presence on our nearest celestial neighbor.