For over half a century, people in Central Africa have told tales of the fish seen climbing waterfalls, but these claims have never been officially confirmed. Now, these fish have finally been caught on camera, studied more closely, and described in a study published in Scientific Reports.

An arduous vertical journey
The shellear fish (Parakneria thysi), found in the upper Congo Basin, are tiny 37–48 mm-long fish that can grow up to a size of around 96 mm. Researcher Pacifique Kiwele Mutambala from the University of Lubumbashi in the Democratic Republic of the Congo and his team documented the shellear fish climbing waterfalls from 2018–2020. In particular, the fish were recorded scaling the Luvilombo Falls on the Luvilombo River, which is a 50-foot (15 meter) waterfall. Thousands of shellear were seen migrating upstream, clinging to wet rock surfaces in the splash zone.

Humans may have been shaped in part by an unexpected force: repeated exposure to high-temperature burn injuries. New research suggests this long history has influenced how the body repairs damage, responds to infection, and reacts under severe trauma.

For over a million years, the ability to control fire has been central to human progress. It enabled cooking, warmth, and later technological development, helping drive both cultural and genetic change that distinguishes humans from other species. At the same time, this close relationship with fire introduced a unique and persistent risk of high-temperature injuries.

Humans experience burns, and survive them, far more often than other animals. While most species instinctively avoid fire, humans have integrated it into daily life. As a result, minor burns are a common experience for most people.

A study published in BioEssays, led by researchers at Imperial College London, proposes that this repeated exposure to burns may have shaped human evolution. The findings suggest that humans developed genetic traits that differ from other primates and mammals, influencing how the body handles both mild and severe burn injuries.

A Chinese satellite equipped with a robotic "octopus arm" has passed a key refueling test in low Earth orbit (LEO), according to state-run media. The achievement highlights China's continued leadership with this particular technology, which NASA has not yet caught up with.

The experimental spacecraft will eventually deploy a giant balloon in LEO, which could help solve another important issue surrounding satellite "megaconstellations" like SpaceX's Starlink network.

The satellite, dubbed Hukeda-2 (also known as Yuxing-3 06 within China), launched March 16 aboard the Kuaizhou-11 rocket from Jiuquan Satellite Launch Center, according to the website of Jonathan McDowell, a now-retired astronomer at the Harvard and Smithsonian Center for Astrophysics who has been tracking the movements of Earth-orbiting spacecraft for more than two decades. It was one of eight satellites deployed during this mission, and it is now orbiting Earth at an altitude of around 335 miles (540 kilometers).

Hukeda-2 is a demonstration satellite intended to test new technologies in LEO. Its most notable attachment is an octopus-like robotic arm that "can curl, twist and wrap around objects to work in tight, complex spaces, with a nozzle-like tip at one end designed to line up and connect with a target port," according to the South China Morning Post.

The arm is made of a series of spring-like tubes threaded with cables attached to a motor, allowing it to bend in almost any direction and make the small adjustments needed to dock with another satellite while both spacecraft are traveling at speeds of around 16,800 mph (27,000 km/h).

Using high-intensity lasers, researchers have taken an important step toward miniaturization of particle accelerators by demonstrating free-electron laser amplification at extreme ultraviolet wavelengths (27–50 nm), with an acceleration length of only a few millimeters. By generating high-quality, monoenergetic electron beams (i.e. beams where all the electrons have nearly the same energy), they have achieved a key milestone toward compact accelerator technologies.

The doctoral thesis of Sophia Hollick, Ph.D. '25, a recent graduate of Yale's Wright Lab in professor Reina Maruyama's group, has significantly contributed to answering a decades-long question in her field about whether or not a signal observed in an experiment that has taken data since 1997 was indicative of a direct detection of dark matter. The results of her analysis, which have excluded the dark matter explanation with greater confidence, were published in Physics Review Letters in the article "Combined Annual Modulation Dark Matter Search with COSINE-100 and ANAIS-112."

Testing DAMA
In 1997, the DAMA/NaI experiment at the Gran Sasso National Laboratory in Italy observed a signal whose annual variability was suggestive of dark matter. Despite the follow-up DAMA/LIBRA experiment producing similar results, claims of direct dark matter detection drew skepticism from the physics community.

To test the claims independently, sister experiments ANAIS-112 and COSINE-100 were constructed using the same basic design as DAMA/NaI and DAMA/LIBRA. COSINE-100, located at the Yangyang Underground Laboratory in South Korea, began taking data in 2016. ANAIS-112, located at the Canfranc Underground Laboratory (LSC) in Spain, began taking data in 2017. Maruyama is the Principal Investigator (PI) and scientific co-spokesperson of COSINE-100.

All of these experiments were designed to search for the signature of a dark matter candidate scattering off the sodium iodide detector. Such a signature should contain a distinct annual modulation because the detector's speed relative to the Milky Way's dark matter varies as Earth orbits the sun. Observations of such modulation by DAMA/NaI and DAMA/LIBRA are inconsistent with other direct-detection experiments and with model predictions. But the reproducibility of these observations had not been tested robustly using identical techniques.

ANAIS-112 and COSINE-100 enabled such a test by using the same sodium iodide detector material as the DAMA experiments, while including some extra analysis techniques designed to reduce background noise and increase event-detection rates.

The data sets from both ANAIS-112 and COSINE-100, each working independently, were found to contain no such variability, tentatively ruling out dark matter as the cause of the earlier observations. Hollick's 2025 thesis combined the data from both ANAIS-112 and COSINE-100, and statistical analysis of the combined dataset showed no significant evidence of annual modulation in the relevant energy regions. This result effectively rules out dark matter as the origin for the DAMA/LIBRA signal.

Hollick explained, "These results end a longstanding debate (almost 30 years) about the source of the DAMA/LIBRA annual modulation signal. They show that, due to the irreproducibility of the signal in COSINE-100 and ANAIS-112, the modulation cannot be attributed to dark matter."

Researchers at the Institute of Materials Science of Seville (ICMS), a joint center of the Spanish National Research Council (CSIC) and the University of Seville (US), have created a hybrid device that can generate energy from both sunlight and rainfall at the same time.

At the core of the system is a patented thin film that protects perovskite solar cells and improves their durability, even in harsh weather. The same film also enables nanogenerators to produce more than 100 volts from the impact of a single raindrop, which is enough to power small portable electronics.

Halide perovskite solar cells are made from synthetic crystalline materials that absorb sunlight very efficiently. While silicon remains the dominant material in solar technology, perovskites are considered a promising alternative because they combine high performance with lower production costs.

DNA carries the genetic instructions for all living things, but it is also an extraordinarily dense way to store information. Just one gram can hold roughly 215 million gigabytes of data.

If that level of storage could be harnessed in electronics, it could lead to far more efficient data centers, faster processing, and the ability to handle much more complex information. The challenge has been making a biological molecule like DNA work within electronic systems. Researchers at Penn State say they have now found a way to connect the two.

The team’s approach, reported in Advanced Functional Materials with a patent application underway, relies on two main components. One is synthetic DNA, made from chemically engineered short sequences designed for specific electronic functions. The other is crystalline perovskite, a semiconductor widely used in solar cells, lasers, and data storage devices.

“Biology and electronics are different domains,” said Kavya S. Keremane, co-corresponding author and postdoctoral researcher in materials science and engineering at Penn State. “Bridging these two fields required developing an entirely new materials platform that allows them to function seamlessly together. By combining the information storage capabilities of DNA with the exceptional electronic properties of perovskite semiconductors, we created a bio-hybrid system that fundamentally changes how low-power memory devices can be designed.”

The Atlantic current system, or more formally the Atlantic Meridional Overturning Circulation (AMOC), is more likely to weaken than previously thought. That's the conclusion of a new study published in the journal Science Advances, which used more refined modeling techniques to get a clearer picture of the future. If these new projections are correct, the consequences could be severe, particularly for Europe and Africa.

The AMOC is a major system of Atlantic Ocean currents that helps regulate climate by transporting heat from the tropics toward the North Atlantic. It is often likened to a conveyor belt because it carries warm water north, where it cools and sinks before flowing back south deep underwater.

While it was already known to be weakening, most climate models disagree on the exact magnitude of the decline, but generally point to a one-third reduction by 2100. However, this new study puts the figure at a much more substantial 51%.

NASA has given approval to begin implementing its project to support ESA's Rosalind Franklin mission. Scheduled to launch in 2028, this Mars rover will be the first to search for signs of past or present life under the Red Planet’s surface. go.nasa.gov/4vAIeX1

Why do some people struggle to adapt to new information and stay locked into outdated beliefs?

Scientists at MIT may have found a key reason. A newly identified gene mutation appears to disrupt a brain circuit that helps us update our understanding of the world. When this system fails, the brain may cling to old ideas even when reality changes.

In experiments with mice, researchers showed that this mutation interferes with the brain’s ability to adjust decisions based on new input, a problem that closely mirrors cognitive symptoms seen in schizophrenia.

The mutation occurs in a gene called grin2a, previously linked to schizophrenia in large genetic studies. The findings suggest that targeting this circuit could eventually help improve cognitive function in some patients.

“If this circuit doesn’t work well, you cannot quickly integrate information,” says Guoping Feng, the James W. and Patricia T. Poitras Professor in Brain and Cognitive Sciences at MIT, a member of the Broad Institute of Harvard and MIT, and the associate director of the McGovern Institute for Brain Research at MIT. “We are quite confident this circuit is one of the mechanisms that contributes to the cognitive impairment that is a major part of the pathology of schizophrenia.”

As the four Artemis astronauts approached a high point of their lunar mission—getting slung around the far side of the moon—NASA staffers crowded into Houston's famed mission control room Monday for a team photo.

They were all smiles as countdown clocks ticked and the Orion spacecraft flew ever closer to Earth's cratered neighbor, a mission years in the making come to fruition at last.

By most metrics it's been a rough year for science in the United States—the Trump administration has slashed funding, halted projects and devastated workforces.

But then, NASA sent astronauts around the moon for the first time in half a century, deeper into space than ever before.

The moonshot has served as a "massive positive moment," said exploration scientist Jacob Bleacher.

"People have been working on this for months, years—over a decade in some cases," he told AFP.

The majority of Americans, including NASA scientists, weren't yet born when the Apollo era first sent astronauts to the moon in the late 1960s.

In a discovery that could reshape how scientists think about fluids, researchers at Drexel University have found that under certain conditions, a simple liquid can break apart like a solid. The study, published in Physical Review Letters, shows that viscous liquids can suddenly fracture when stretched with enough force.

This unexpected behavior points to viscosity, or a liquid’s resistance to flowing, as a key factor in how liquids respond to stress. It also suggests new ways liquids could be controlled in technologies ranging from hydraulics and 3D printing to biological systems like blood flow.

“Our findings show that if pulled apart with enough force per area, a simple liquid — a liquid that flows — will reach what we call a point of ‘critical stress,’ when it will actually fracture like a solid. And this is likely true for all simple liquids, including common examples, such as water and oil,” said Thamires Lima, PhD, an assistant research professor in Drexel’s College of Engineering, who helped to lead the research. “This fundamentally changes our understanding of fluid dynamics.”

Loneliness is something most of us will experience at some point. It is a normal emotion, not a character flaw. But it is also something that can quietly affect how we think and remember, and researchers have long debated whether it might even raise the risk of dementia.

A new study, published in [the journal] Aging and Mental Health, suggests the picture is more complicated than either side of that debate has allowed for.

First, it is worth being clear about what dementia actually is. It is not a single diagnosis but an umbrella term covering a range of conditions — the most familiar being Alzheimer's disease — that cause memory loss, confusion, difficulties with language and a gradual loss of independence.

Cognitive decline, meaning a general slowing or weakening of mental function, is not the same thing. The two terms are often used interchangeably, but they should not be: you can experience cognitive decline without ever developing dementia.

We do not fully understand what causes Alzheimer's. We know that a healthy lifestyle lowers the risk, but it is no guarantee. Plenty of people who have done everything right still develop it. The disease is shaped by genetics, aging and biological factors we are still working to understand.

The new study followed just over 10,000 adults aged between 65 and 94 over six years. All were in good health at the outset, fully independent and free of dementia. Researchers tracked their memory over that period and asked whether loneliness played a role in how it changed.

The answer was nuanced.

Five years ago today, NASA’s Ingenuity Mars Helicopter took its first flight on Mars!

After 72 flights, 11 miles flown, and a top altitude of 24 meters, Ingenuity ended its mission on January 25, 2024.

On April 17, engineers at NASA's Jet Propulsion Laboratory (JPL) in Southern California sent commands to shut down an instrument aboard Voyager 1 called the Low-energy Charged Particles experiment, or LECP. The nuclear-powered spacecraft is running low on power, and turning off the LECP is considered the best way to keep humanity's first interstellar explorer going.

The LECP has been operating almost without interruption since Voyager 1 launched in 1977—almost 49 years. It measures low-energy charged particles, including ions, electrons, and cosmic rays originating from our solar system and galaxy. It has provided critical data about the structure of the interstellar medium, detecting pressure fronts and regions of varying particle density in the space beyond our heliosphere. The twin Voyagers are the only spacecraft that are far enough from Earth to provide this information.

The choice of which instrument to turn off next wasn't made in the heat of the moment. Years ago, the Voyager science and engineering teams sat down together and agreed on the order in which they would shut off parts of the spacecraft while ensuring the mission can continue to conduct its unique science. Of the 10 identical sets of instruments that each spacecraft carries, seven have been shut off so far. For Voyager 1, the LECP was next on that list. The team shut off the LECP on Voyager 2 in March 2025.

Only one chance in this lifetime…

Like watching sunset at the beach from the most foreign seat in the cosmos, I couldn’t resist a cell phone video of Earthset. You can hear the shutter on the Nikon as Christina H Koch is hammering away on 3-shot brackets and capturing those exceptional Earthset photos through the 400mm lens. Victor Glover was in window 3 watching with Jeremy R. Hansen next to him.

I could barely see the Moon through the docking hatch window but the iPhone was the perfect size to catch the view…this is uncropped, uncut with 8x zoom which is quite comparable to the view of the human eye. Enjoy.

Blue Origin, the U.S. space company of Amazon founder Jeff Bezos, on Sunday successfully reused and recovered a booster for its New Glenn rocket, confirming its mastery of a technical feat that could boost its launch cadence and expand its rivalry with SpaceX.

But the uncrewed mission also suffered a partial setback: the satellite carried into space by the rocket did not settle into the right orbit.

The company has launched the New Glenn twice before, but only with new rocket boosters. It has previously launched its smaller New Shepard rocket, primarily used for suborbital space tourism, with reused components in a less technically challenging operation.

The novel recycling approach comes amid fierce competition between Bezos's firm and fellow tech titan Elon Musk's SpaceX, which has also recovered a booster from a launched rocket.

The New Glenn rocket, standing at 98 meters (321 feet) tall, lifted off from Florida's Cape Canaveral with its reused booster at about 7:25 a.m. (1125 GMT) carrying a communications satellite for the company AST SpaceMobile.

After liftoff, the rocket's two stages separated, with the upper stage continuing its journey carrying the satellite into space. Its booster successfully landed on a floating platform in the Atlantic Ocean about nine minutes and 30 seconds after takeoff.

Blue Origin said later in a statement on X that the satellite turned on properly but was placed in "an off-nominal orbit." The gravity of this error was not immediately known. The company said it was assessing the mishap.

In November, Blue Origin recovered a New Glenn booster for the first time, succeeding in the complex technical challenge that culminated with a controlled vertical landing on a floating platform.

A previous attempt in January 2025 to recover the booster was unsuccessful after its engines failed to reignite during descent.

The booster used in Sunday's launch was refurbished after its previous flight. For this first reuse, the company replaced all of its engines and made several other modifications.