Autism has historically been viewed as a condition that affects men and boys more frequently than women and girls. But a massive new study based on data from millions of people suggests this isn't actually the case, at least in Sweden.

While boys are diagnosed with the condition at higher rates during childhood, by adulthood, the ratio is roughly 1:1. This suggests it's not a case of fewer women having autism: it's just that they aren't diagnosed until later in life.

Autism spectrum disorder (ASD) diagnosis rates have been climbing since the 1990s, but diagnoses are not equal between males and females. The DSM-5, which defines mental health conditions and recommended treatments, states that for every four males diagnosed with autism, only one female receives a diagnosis.

But the recent study, led by medical epidemiologist Caroline Fyfe of the Karolinska Institute in Sweden, paints a very different picture, adding to a growing body of research that suggests autistic women and girls are being let down by current systems of diagnosis and treatment.

Hop on board Mars Express, for a flight over Flaugergues Crater.

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In the new study, the team subjected a sample of the metal-rich Campo del Cielo meteorite to 27 high-energy pulses of the 440 gigaelectronvolt SPS proton beam, in order to recreate impact conditions and measure their effects. While not necessarily bad news for those who want a real-life Armageddon, the meteor sample didn't quite act how one would expect. 

“The material became stronger, exhibiting an increase in yield strength, and displayed a self-stabilising damping behaviour,” Melanie Bochmann, co-team lead, explained in a statement. 

"These results suggest that high-energy proton irradiation not only hardens iron meteorite material but may transform it into a composite-like structure with improved damping characteristics," the team added in their paper.

In short, the meteorite held together a lot better than expected. While making a potentially-deadly asteroid stronger doesn't sound like a particularly good idea, the goal is not to shatter it apart, but to deflect it onto a safe course for Earth. On that front, this may actually be good news.

Duplicated genes that appear in every branch of the tree of life can provide us with insight into the evolution that occurred between the first lifeform and the last from which we all descend, geneticists claim.

As far as we can tell, life only evolved on Earth once, and everything alive today is a descendant of that initial breakthrough. However, the divergence that gave us mushrooms, mice, and maple trees probably didn’t take place straight away. That is, the tree of life had a trunk, possibly quite a long one, before it started branching off into familiar kingdoms like animals, plants, fungi, and bacteria, let alone into further divisions within each. 

The point immediately before the branching began is known as the Last Universal Common Ancestor (LUCA). We think we have learned something of LUCA’s nature by looking for traits all surviving lifeforms share. But what about LUCA’s predecessors? What can we learn about the steps that turned those first strands of RNA into LUCA? It’s widely assumed the answer is nothing, but a new paper challenges that view.

“While the last universal common ancestor is the most ancient organism we can study with evolutionary methods,” said Professor Aaron Goldman of Oberlin College in a statement, “some of the genes in its genome were much older.”

Attempts to reconstruct LUCA have reached the conclusion it was a relatively complex organism, one that could not have spontaneously appeared. Instead, LUCA was the product of a long period of evolution from simpler life.

Remarkably, Goldman and colleagues say they can expose some of that process by reconstructing LUCA’s genes. 

New infrared observations reveal the rare interstellar visitor comet 3I/ATLAS dramatically brightening during its farewell tour of the solar system.

NASA's SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer) space telescope captured views in December 2025 of the comet releasing a surge of gas, dust and complex molecules two months after the object's closest approach to the sun — a surprising outburst that's giving scientists their clearest chemical look yet at material formed around another star, according to a statement from NASA.

The SPHEREx images were taken as the comet was already heading back out of the inner solar system. Instead of fading quietly into the dark, 3I/ATLAS flared with activity, developing a glowing coma rich in water vapor, carbon dioxide and organic compounds. Observations also show a pear-shaped dust tail, created by rocky material being ejected as the comet's activity increases.

The names of nearly 11 million Earthlings are riding along with Perseverance as it explores the Martian landscape. (This view was taken on Tuesday.)

There's still time to send your name to travel with NASAArtemis astronauts on their journey to the Moon! go.nasa.gov/artemisnames

Anew breakthrough in the pathology of glioblastoma – the most common type of brain cancer, currently incurable – has been found, opening up the potential for a future treatment that could be as simple as taking a pill.

Each year, more than 14,000 people in the US alone will be diagnosed with glioblastoma, an aggressive, unpredictable, and unpreventable brain cancer. Each one of those new patients will live an average of 12 to 18 more months – without any treatment, it can be much less – and only one in 20 will still be alive after five years.

“Glioblastoma is a devastating disease. Essentially no effective therapy exists,” said Hui Li, a researcher in the University of Virginia School of Medicine’s Department of Pathology, in a statement this week. But back in 2020, Hui and his colleagues made a first step towards finding one: they discovered the so-called “oncogene” that triggers the development of glioblastoma.

“The novel oncogene we discovered promises to be an Achilles’ heel of glioblastoma,” he said at the time, “with its specific targeting potentially an effective approach for the treatment of the disease.”

Now, his team have announced the next stage in the development of a treatment or cure for glioblastoma: the identification of a specific molecule which can block the activity of this oncogene, and which, in mouse studies, was able to destroy glioblastoma cells without affecting healthy tissue.

“What’s novel here is that we’re targeting a protein that [glioblastoma] cells uniquely depend on, and we can do it with a small molecule that has clear in vivo activity,” Li explained. “To our knowledge, this pathway hasn’t been therapeutically exploited before.”

Many tiny specks of ancient water are locked within one of the oldest and most famous Martian meteorites ever to fall to Earth, a new study finds. The surprising discovery, achieved using a new form of "neutron scanning," reveals more clues about the Red Planet's watery past, which may have set the stage for extraterrestrial life to flourish.

Meteorite NWA 7034, more commonly known as Black Beauty, is a roughly 11-ounce (320 grams) chunk of Mars that was ejected when another space rock slammed into the Red Planet. It was discovered in 2011 by nomads in the Moroccan region of the Sahara Desert, although it is unclear when it fell to Earth. The meteorite has since become famous for its dark hue, which has been further accentuated by heavy polishing on one of its faces.

Black Beauty likely originates from the 6-mile-wide (10 kilometers) Karratha crater near Mars' equator, and was ejected into space between 5 million and 10 million years ago, according to Live Science's sister site Space.com. However, it is much older than that, and scientists have since dated the coal-like rock to at least 4.44 billion years ago, making it the oldest Martian meteorite found to date.

New research suggests that dark matter, the universe's most puzzling and mysterious substance, may not exist. But removing dark matter from our cosmological models could hinge on the possibility that gravity behaves differently on very large scales, one scientist says.

Dark matter has been a thorn in the side of physicists because, despite outweighing ordinary matter by a ratio of 5 to 1, it remains effectively invisible. That's because it doesn't interact with light, or more technically, electromagnetic radiation. Because the particles that comprise the atoms that make up stars, planets, moons, living things, and everything we see around us, do interact with light, scientists have been searching for particles that could make up dark matter. However, this addition to particle physics, which has thus far eluded all attempts to uncover it, isn't needed if we are wrong about how gravity behaves on galactic scales. At least, that is what Naman Kumar of the Indian Institute of Technology suggests.

Averill is one of a group of researchers who are exploring a new potential avenue for treating PTSD: psychedelics. Psychedelic-assisted psychotherapy, using MDMA or psilocybin, may act on the brain systems disrupted in PTSD, rather than simply treating the symptoms.

The early findings have been positive: A recent clinical trial showed that 67% of patients who received MDMA-assisted therapy no longer met PTSD criteria after treatment, compared with 32% in the placebo group, and clinical trials investigating psilocybin's potential to treat the condition are showing promise.

Averill is currently leading a pioneering Texas state-funded clinical trial investigating psilocybin for veterans with PTSD and has seen how quickly the drugs can act.

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Researchers at Duke-NUS Medical School, together with international collaborators, have produced one of the most detailed single-cell maps of the developing human brain to date. This atlas catalogues almost every type of brain cell, documents their genetic signatures, and shows how they grow and communicate with one another. It also evaluates leading laboratory techniques used to generate high-quality neurons, representing a key advance toward new treatments for Parkinson’s disease and other neurological conditions.

Why Parkinson’s disease is a central focus
Parkinson’s disease is the second most common neurodegenerative disorder in Singapore and affects roughly three in every 1,000 people aged 50 and above. The disease destroys midbrain dopaminergic neurons—the cells responsible for releasing dopamine, a chemical essential for movement control and learning. Replacing or restoring these damaged cells could eventually help reduce symptoms such as tremors and loss of mobility.

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A crew of four, including esa's Soph astro, is getting ready for launch from NASA Kennedy in Florida, NET 11 February.

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Oxygen is everywhere on Earth today. But that hasn’t always been the case. Scientists think oxygen only became a lasting part of the atmosphere about 2.3 billion years ago during the Great Oxidation Event (GOE), a turning point that ultimately shaped the rise of oxygen-using life.

Now, new research from MIT points to an even earlier chapter in this story. The team suggests that some ancient organisms may have learned to use oxygen hundreds of millions of years before the GOE. If correct, the evidence could rank among the earliest signs of aerobic respiration ever identified.

A juvenile sea urchin moving across its habitat, filmed at 10x magnification by zoologist Dr. Alvaro Migotto. See the rest of the winners of Nikon’s Small World in Motion competition in 2025: on.natgeo.com/4qzYUul

Alzheimer’s disease (AD) is the most common cause of dementia and affects close to 40 million people worldwide. As the condition progresses, individuals gradually lose memory, cognitive abilities, and independence. Despite decades of intensive research, there are still no treatments capable of stopping or reversing the underlying disease process.

One of the key drivers of brain dysfunction in AD is the protein tau. Under normal conditions, tau helps maintain the internal structure of neurons, supporting the transport systems that allow nerve cells to function properly. In Alzheimer’s disease, however, tau becomes abnormally modified and begins to clump together. These aggregates interfere with normal cellular transport, damage neurons, and ultimately contribute to memory impairment.

Now, an international team of scientists has identified a previously unrecognized way to protect the brain from this degeneration. Their research shows that increasing levels of the naturally occurring molecule NAD⁺ can counteract neurological damage linked to Alzheimer’s disease. The study was published in the journal Science Advances.

The collaboration was led by Associate Professor Evandro Fei Fang at the University of Oslo and Akershus University Hospital in Norway, together with Professor Oscar Junhong Luo from Jinan University in China and Associate Professor Joana M. Silva from the University of Minho in Portugal.

How NAD⁺ supports brain health
NAD⁺ (Nicotinamide adenine dinucleotide, oxidized form) is an essential molecule involved in cellular energy production and the ability of neurons to cope with stress. Levels of NAD⁺ naturally decline with age and drop even further in many neurodegenerative disorders.

“Previous research has suggested that boosting NAD⁺ using precursor compounds such as nicotinamide riboside (NR) or nicotinamide mononucleotide (NMN) can produce beneficial effects in animal models of AD and in early-stage clinical studies. However, the biological processes responsible for these effects have remained poorly understood,” explains first author Alice Ruixue Ai.

The new study reveals that NAD⁺ works through a previously unidentified RNA-splicing pathway. This pathway is regulated by a protein called EVA1C, which plays an essential role in the process of RNA splicing. RNA splicing allows a single gene to produce multiple isoforms of a protein, and one isoform may show distinctive effects on the other isoforms. Its dysregulation is one of the most recently acknowledged risk factors for AD.

The James Webb Space Telescope (JWST) was designed to look back in time and study galaxies that existed shortly after the Big Bang. In so doing, scientists hoped to gain a better understanding of how the universe has evolved from the earliest cosmological epoch to the present. When Webb first trained its advanced optics and instruments on the early universe, it discovered a new class of astrophysical objects: bright red sources that were dubbed "Little Red Dots" (LRDs). Initially, astronomers hypothesized that they could be massive star-forming regions, but this was inconsistent with established cosmological models.

In essence, those models predicted that massive galaxies could not have formed less than a billion years after the Big Bang. This led to the theory that they might be quasars, the bright central regions of galaxies powered by supermassive black holes (SMBHs). This also challenged established models, as it was theorized that SMBHs wouldn't have had enough time to form either. In a recent paper posted to the arXiv preprint server, a team of astronomers led by Harvard University demonstrated that the mystery of LRDs could be explained by identifying them with accreting Direct Collapse Black Holes (DCBHs).

Their research is based on radiation-hydrodynamic (RHD) simulations developed to model the emission properties of DCBHs, a class of black holes that form directly from clouds of cold gas. This differs from conventional models that predict how black holes form from the collapse of massive stars. These massive stars, a theoretical class known as Population III, were the first stars in the universe, forming from hydrogen and helium with little to no traces of heavier elements (like metals).

Scientists at the University of New Hampshire are using artificial intelligence to dramatically speed up the search for new magnetic materials. Their approach has produced a searchable database containing 67,573 magnetic materials, including 25 previously unknown compounds that retain their magnetism at high temperatures, a key requirement for many real-world applications.

“By accelerating the discovery of sustainable magnetic materials, we can reduce dependence on rare earth elements, lower the cost of electric vehicles and renewable energy systems, and strengthen the U.S. manufacturing base,” said Suman Itani, lead author of the study and a doctoral student in physics.

A bottleneck in magnetic materials
The new resource, called the Northeast Materials Database, is designed to make it easier for researchers to explore the vast range of magnetic materials that underpin modern technology, from smartphones and medical devices to power generators and electric vehicles.

Today’s most powerful permanent magnets depend heavily on rare earth elements that are costly, largely imported, and increasingly difficult to secure. Despite the fact that scientists know many magnetic compounds exist, none have yet replaced rare-earth-based magnets in widespread use, creating a major bottleneck in materials innovation.

Lava tubes are natural underground tunnels formed by volcanic activity.

They typically originate in basaltic lava flows, where low-viscosity lava is either entrenched and crusted over or inflated in-between preexisting lava layers

Beside Earth, evidence of lava tubes has been identified on other celestial bodies such as Mars and the Moon.

For example, recent research provides compelling evidence of a subsurface cave conduit beneath the Mare Tranquillitatis Pit on the Moon.

The existence of lava tubes on Venus has been largely hypothesized but never confirmed.

“Our knowledge of Venus is still limited, and until now we have never had the opportunity to directly observe processes occurring beneath the surface of Earth’s twin planet,” said University of Trento’s Professor Lorenzo Bruzzone.

“The identification of a volcanic cavity is therefore of particular importance, as it allows us to validate theories that for many years have only hypothesized their existence.”

“This discovery contributes to a deeper understanding of the processes that have shaped Venus’ evolution and opens new perspectives for the study of the planet.”

A possible alternative to active debris removal (ADR) by laser is ablative propulsion by a remotely transmitted electron beam (e-beam). The e-beam ablation has been widely used in industries, and it might provide higher overall energy efficiency of an ADR system and a higher momentum-coupling coefficient than laser ablation. However, transmitting an e-beam efficiently through the ionosphere plasma over a long distance (10 m–100 km) and focusing it to enhance its intensity above the ablation threshold of debris materials are new technical challenges that require novel methods of external actions to support the beam transmission.

Therefore, Osaka Metropolitan University researchers conducted a preliminary study of the relevant challenges, divergence, and instabilities of an e-beam in an ionospheric atmosphere, and identified them quantitatively through numerical simulations. Particle-in-cell simulations were performed systematically to clarify the divergence and the instability of an e-beam in an ionospheric plasma.