Science

nasa’s-first-medical-evacuation-from-space-ends-with-on-target-splashdown

NASA’s first medical evacuation from space ends with on-target splashdown

“Because the astronaut is absolutely stable, this is not an emergent evacuation,” said James “JD” Polk, NASA’s chief medical officer, in a press conference last week. “We’re not immediately disembarking and getting the astronaut down.”

Amit Kshatriya, the agency’s associate administrator, called the situation a “controlled medical evacuation” in a briefing with reporters.

But without a confirmed diagnosis of the astronaut’s medical issue, there was some “lingering risk” for the astronaut’s health if they remained in orbit, Polk said. That’s why NASA Administrator Jared Isaacman and his deputies agreed to call an early end to the Crew-11 mission.

A first for NASA

The Crew-11 mission launched on August 1 and was supposed to stay on the space station until around February 20, a few days after the scheduled arrival of SpaceX’s Crew-12 mission with a team of replacement astronauts. But the early departure means the space station will operate with a crew of three until the launch of Crew-12 next month.

NASA astronaut Chris Williams will be the sole astronaut responsible for maintaining the US segment of the station. Russian cosmonauts Sergey Kud-Sverchkov and Sergey Mikayev launched with Williams in November on a Russian Soyuz vehicle. The Crew Dragon was the lifeboat for all four Crew-11 astronauts, so standard procedure called for the entire crew to return with the astronaut suffering the undisclosed medical issue.

The space station regularly operated with just three crew members for the first decade of its existence. The complex has been permanently staffed since 2000, sometimes with as few as two astronauts or cosmonauts. The standard crew size was raised to six in 2009, then to seven in 2020.

SpaceX’s Crew Dragon Endeavour spacecraft descends toward the Pacific Ocean under four main parachutes.

Credit: NASA

SpaceX’s Crew Dragon Endeavour spacecraft descends toward the Pacific Ocean under four main parachutes. Credit: NASA

Williams will have his hands full until reinforcements arrive. The scaled-down crew will not be able to undertake any spacewalks, and some of the lab’s science programs may have to be deferred to ensure the crew can keep up with maintenance tasks.

This is the first time NASA has called an early end to a space mission for medical reasons, but the Soviet Union faced similar circumstances several times during the Cold War. Russian officials cut short an expedition to the Salyut 7 space station in 1985 after the mission’s commander fell ill in orbit. A similar situation occurred in 1976 with the Soyuz 21 mission to the Salyut 5 space station.

NASA’s first medical evacuation from space ends with on-target splashdown Read More »

a-british-redcoat’s-lost-memoir-resurfaces

A British redcoat’s lost memoir resurfaces


Shadrack Byfield lost his left arm in the War of 1812; his life sheds light on post-war re-integration.

Actor Chris McKay playing Shadrack Byfield (center) in the 2011 PBS documentary The War of 1812. Credit: Tom Fournier

History buffs are no doubt familiar with the story of Shadrack Byfield, a rank-and-file British redcoat who fought during the War of 1812 and lost his left arm to a musket ball for his trouble. Byfield has been featured in numerous popular histories—including a children’s book and a 2011 PBS documentary—as a shining example of a disabled soldier’s stoic perseverance. But a newly rediscovered memoir that Byfield published in his later years is complicating that idealized picture of his post-military life, according to a new paper published in the Journal of British Studies.

Historian Eamonn O’Keeffe of Memorial University of Newfoundland in St. John’s, Canada, has been a Byfield fan ever since he read the 1985 children’s novel, Redcoat, by Gregory Sass. His interest grew when he was working at Fort York, a War of 1812-era fort and museum, in Toronto. “There are dozens of memoirs written by British rank-and-file veterans of the Napoleonic Wars, but only a handful from the War of 1812, which was much smaller in scale,” O’Keeffe told Ars. “Byfield’s autobiography seemed to offer an authentic, ground-level view of the fighting in North America, helping us look beyond the generals and politicians and grapple with the implications of this conflict for ordinary people.

Born in 1789 in Wiltshire’s Bradford-on-Avon suburbs, Byfield’s parents intended him to follow in his weaver father’s footsteps. He enlisted in the county militia when he turned 18 instead, joining the regular army the following year. When the War of 1812 broke out, Byfield was stationed at Fort George along the Niagara River, participating in the successful siege of Fort Detroit. At the Battle of Frenchtown in January 1813, he was shot in the neck, but he recovered sufficiently to join the campaigns against Fort Meigs and Fort Stephenson in Ohio.

After the British were defeated at the Battle of Thames later that year, he escaped into the woods with indigenous warriors, despite his concerns that they meant to kill him. They did not, and Byfield eventually rejoined other British fugitives and made his way back to the British lines. He was one of 15 out of 110 soldiers in his light company still alive after 18 months of fighting.

But his luck ran out in July 1914. While engaged in a skirmish at Conjocta Creek, a musket ball tore through his left forearm. Surgeons were forced to amputate after gangrene set in—a procedure that was performed without anesthesia. Byfield described the operation as “tedious and painful” in A Narrative of a Light Company Soldier’s Service, the memoir he published in 1840, adding, “I was enabled to bear it pretty well.”

Byfield famously became incensed when he discovered his severed limb had been tossed into a dung heap with other amputated body parts. He retrieved his forearm and insisted on giving it a proper burial in a makeshift coffin he built himself. Due to his injury, Byfield’s military career was over, and he returned to England. While he was given an army pension, the sum (nine pence per day) was inadequate to support the veteran’s growing family.

Byfield couldn’t take up his father’s weaving trade because it took two hands to operate a loom. But according to his 1840 Narrative, he had a dream one night of an “instrument” that would enable him to work a loom with just one arm, which he successfully built with the help of a local blacksmith. He found work spinning thread at a textile mill and weaving it into finished cloth, augmenting that trade by working as a wheelchair attendant at a spa in Bath, among other odd jobs. He later found a mentor in Colonel William Napier, a distinguished veteran and military historian who arranged for an increase in Byfield’s pension, as well as finding a publisher for the Narrative.

A shifting narrative

Byfield’s 1840 memoir became a much-cited source for historians of the War of 1812 since it offered a personal perspective on those events from a rank-and-file British soldier. Historians had long assumed that Byfield died around 1850. But during his research, O’Keeffe discovered a second Byfield memoir in the collection of the Western Reserve Historical Society, published in 1851, entitled History and Conversion of a British Soldier. O’Keeffe believes this to be the only surviving copy of the 1851 memoir.

“I quickly noticed that [Byfield] appeared in British census records past the c.1850 date at which he was supposed to have died, according to the Canadian Encyclopedia entry on Byfield and other sources,” said O’Keeffe. “This discrepancy was my first indication that there might be more to discover on Byfield, and every time I returned to the subject I kept finding more information.” Byfield actually died in January 1874 at 84 years old. While historians had also assumed that Byfield was functionally illiterate, O’Keeffe found a draft manuscript of the 1840 memoir in Byfield’s handwriting, suggesting the soldier had acquired those skills after the war.

“My initial interest was sparked by the wartime memoir I already knew about, but I was increasingly fascinated by his later life, and what it could tell us about the experiences of veterans in general,” said O’Keeffe. “In most history books, British redcoats take center stage for the defeat of Napoleon at the Battle of the Waterloo, but then quickly vanish from view; no doubt this is true for veterans of most if not all wars. Military memoirs of the period tend to encourage this dynamic by ending the story at demobilization, assuming that readers would not be interested in the civilian experiences of their authors. But Byfield’s very well-documented life helps bring the process of reintegration, of rebuilding one’s life after war and catastrophic injury, into sharper focus, and highlights the presence of war veterans in 19th-century British society.”

According to O’Keeffe, Byfield painted a much less rosy picture of his post-military life in the 1851 memoir, recounting his struggles with poverty and lingering rheumatic pain in his left stump. (“Oftentimes I was not able to lift my hand to my head, nor a teacup to my mouth,” the former soldier wrote.) When textile mills started closing, he relocated his family to Gloucestershire and eked out a living as a tollkeeper and by selling copies of his earlier Narrative for a shilling. He admitted to taking absence without leave during his war service and participating in plundering expeditions. The later memoir also recounts Byfield’s spiritual awakening and growing religious faith.

Byfield adopted very different narrative themes in his 1840 and 1851 memoirs. “In the 1840 narrative, Byfield sought to impress wealthy patrons by presenting himself as a dutiful soldier and deserving veteran,” said O’Keeffe. “The 1851 memoir, by contrast, was a spiritual redemption story, with Byfield tracing his progress from rebellious sinner to devout and repentant Christian. In the 1851 memoir, the veteran also dwells on periods of indebtedness, illness, and unemployment after returning to England, whereas in his earlier memoir he described maintaining his family ‘comfortably’ with his weaving prosthesis for nearly twenty years.”

Byfield’s luck seemed to change for the better when the Duke of Beaufort became a patron, first hiring the veteran as a gardener on the duke’s Badminton estate. Byfield complained in his 1851 account that the estate steward refused to pay him full wages because he was one-handed, insisting, “I never saw the man that would compete with me with one arm.”

Eventually, Byfield leveraged his connection to the duke to be named caretaker of a 100-foot tower monument to Lord Edward Somerset that was built in the Gloucestershire village of Hawkesbury Upton in 1845. This came with a keeper’s cottage, and the duties were light: Byfield maintained the tower, sold souvenir booklets, and welcomed any sightseers every day except Sundays.

Alas, Byfield became embroiled in a feud over control of the village’s Particular Baptist chapel; some objected to the doctrine and conduct of the minister, John Osborne, while others, like Byfield, defended him. There were lawsuits, arson, vandalism, and a charge of public drunkenness against Byfield, which he vehemently denied. Everything came to a head in an “unholy riot” in the chapel, during which Byfield was accused of starting the fight by “pushing about” and slashing someone’s eye and face with his prosthetic iron hook. Every rioter was acquitted, but the incident cost Byfield his cushy caretaker job in 1853.

Byfield later moved back to his hometown, Bradford-on-Avon, and married a widow after his first wife died. He kept petitioning for further increases to his pension, to no avail, and started peddling a third memoir in 1867 entitled The Forlorn Hope. No copies have survived, per O’Keeffe, but it did garner coverage in a local newspaper, which described the account as relating “the Christian experience of this Wiltshire hero and the great persecutions and trials he has passed through.”

“Years ago, I would have characterized the veteran as someone who was astonishingly phlegmatic about what happened to him,” said O’Keeffe. “Byfield’s description of the amputation comes across as remarkably unemotional to modern readers, and then he presents himself at the end of the first memoir as having literally dreamt up the prosthetic that allowed him to return to his civilian trade and live happily ever after, more or less.”

But as he studied Byfield’s writings more closely, “It became clear that the process of reintegration was far less smooth than this version of events would suggest, and that Byfield’s time in the army shaped the rest of his life in profound ways,” said O’Keeffe. “The fact that Byfield’s daughter chose to put her father’s military rank and regiment in the ‘occupation’ column on his death certificate, rather than listing any of the other jobs the veteran had held in the six decades since his amputation, is the most eloquent testimony of this, I think.”

Journal of British Studies, 2025. DOI: 10.1017/jbr.2025.10169 (About DOIs).

Photo of Jennifer Ouellette

Jennifer is a senior writer at Ars Technica with a particular focus on where science meets culture, covering everything from physics and related interdisciplinary topics to her favorite films and TV series. Jennifer lives in Baltimore with her spouse, physicist Sean M. Carroll, and their two cats, Ariel and Caliban.

A British redcoat’s lost memoir resurfaces Read More »

epa-moves-to-stop-considering-economic-benefits-of-cleaner-air

EPA moves to stop considering economic benefits of cleaner air

The move to exclude the estimated benefits relates specifically to fine particulate matter smaller than 2.5 micrometers (known as PM2.5) and ozone. This particulate matter, commonly produced by combustion, is small enough to make it through your respiratory system and into your bloodstream. For this reason, it is associated with a host of health impacts even beyond respiratory conditions. That has made research on those impacts the target of anti-regulation advocates who claim scientists exaggerate the harm.

Ozone is also a familiar enough pollutant in smoggy areas to be mentioned in weather forecasts as a warning for people with conditions like asthma. Ozone pollution in the lower atmosphere results from reactions between nitrogen oxides and volatile organic compounds emitted by various anthropogenic sources.

The new EPA language claims that past analyses have failed to adequately represent the scientific uncertainty of the economic value of reducing these pollutants. The new economic impact analysis for stationary combustion turbines, for example, says this “leads the public to believe the Agency has a better understanding of the monetized impacts of exposure to PM2.5 and ozone than in reality.” It continues, “Therefore, to rectify this error, the EPA is no longer monetizing benefits from PM2.5 and ozone but will continue to quantify the emissions until the Agency is confident enough in the modeling to properly monetize those impacts.”

A 2024 regulatory impact analysis for stationary combustion turbines had estimated those benefits at $27–$92 million per year for a tightening of emissions limits.

This is not the first time that these numbers have become political targets. Between 2004 and 2008, the Bush administration reduced the EPA’s value of a statistical life by around 11 percent. But instead of moving numbers to the lower end of scientific estimates, the Trump administration is more aggressively weaponizing scientific uncertainty. Functionally, the logic is that since estimates of benefits vary from large to extremely large, the EPA will default to a value of zero. Only the costs will be calculated, and those numbers are sure to be highlighted as justification for loosening pollution limits.

Currently, documentation for how the EPA previously calculated pollution regulation benefits based on research—including transparent assessments of scientific uncertainties—is still available on the EPA website.

EPA moves to stop considering economic benefits of cleaner air Read More »

switching-water-sources-improved-hygiene-of-pompeii’s-public-baths

Switching water sources improved hygiene of Pompeii’s public baths

From well to aqueduct

The specific sites studied included the Stabian baths and related structures, which were built after 130 BCE and remained active until the aforementioned eruption; the Republican baths, built around the same period but abandoned around 30 BCE; the Forum baths, built after 80 BCE; and the aqueduct and its 14 water towers, constructed during the Augustan period.

There were variations in the chemical composition of the deposits, indicating the replacement of boilers for heating water and a renewal of water pipes in the infrastructure of Pompeii, particularly during the time period when modifications were being made to the Republican baths. The results for the Republican baths’ heated pools, for instance, showed clear contamination from human activity, specifically human waste (sweat, sebum, urine, or bathing oil), which suggests the water wasn’t changed regularly.

That is consistent with the limitations of supplying water at the time; the water-lifting machines could really only refresh the water about once a day. After the well shaft was enlarged, the carbonate deposits were much thinner, evidence of technological improvements that reduced sloshing as the water was raised. Once the aqueduct had been built, the bathing facilities were expanded with a likely corresponding improvement in hygiene.

On the whole, the aqueduct was a net good for Pompeii. “The changes in the water supply system of Pompeii revealed by carbonate deposits show an evolution from well-based to aqueduct-based supply with an increase in available water volume and in the scale of the bathing facilities, and likely an increase in hygiene,” the authors concluded. Granted, there was evidence of lead contamination in the water, particularly that supplied by the aqueduct, but carbonate deposits in the lead pipes seem to have reduced those levels over time.

The results may also help resolve a scientific debate about the origins of the aqueduct water: Was it water from the town of Avella that connected to the Aqua Augusta aqueduct or from the wells of Pompeii/springs of Vesuvius? Per the authors, the stable isotope composition of carbonate in the aqueduct is inconsistent with carbonate from volcanic rock sources, thus supporting the Avella source hypothesis.

PNAS, 2025. DOI: 10.1073/pnas.2517276122 (About DOIs).

Switching water sources improved hygiene of Pompeii’s public baths Read More »

that-time-will-smith-helped-discover-new-species-of-anaconda

That time Will Smith helped discover new species of anaconda

In 2024, scientists announced the discovery of a new species of giant anaconda in South America. A National Geographic camera crew was on hand for the 2022 expedition that documented the new species—and so was actor Will Smith, since they were filming for NatGeo’s new documentary series, Pole to Pole with Will Smith. Now we can all share in Smith’s Amazon experience, courtesy of the three-minute clip above.

Along with venom expert Bryan Fry, we follow Smith’s journey by boat with a team of indigenous Waorani guides, scouring the river banks for anacondas. And they find one: a female green anaconda about 16 to 17 feet long, “pure muscle.” The Waorani secure the giant snake—anacondas aren’t venomous but they do bite—so that Fry (with Smith’s understandably reluctant help) can collect a scale sample for further analysis. Fry says that this will enable him to determine the accumulation of pollutants in the water.

That and other collected samples also enabled scientists to conduct the genetic analysis that resulted in the declaration of a new species: the northern green anaconda (Eunectes akayama, which roughly translates to “the great snake”). It is genetically distinct from the southern green anaconda (Eunectes murinus); the two species likely diverged some 10 million years ago. The northern green anaconda’s turf includes Venezuela, Colombia, Suriname, French Guyana, and the northern part of Brazil.

Local Waorani guides subdue a giant green anaconda YouTube/National Geographic

Smith’s time in the Amazon also brought the arachnophobic actor face to face with a giant tarantula while scientists extracted the venom. His further adventures brought him to the South Pole, where he trekked across frigid ice fields; to the Himalayas, where he trekked to a small village in Bhutan; to the Pacific Islands to record a lost native language; to the Kalahari desert, where he joined the hunter-gatherer San people on a hunt; and to the North Pole, where he joined an expedition to dive under the ice to collect scientific samples.

Pole to Pole with Will Smith premieres on January 13, 2026, and will stream on Disney+ the following day.

poster art showing bearded will smith in a parka with snow crystallizing on his beard

Credit: National Geographic

Credit: National Geographic

That time Will Smith helped discover new species of anaconda Read More »

the-oceans-just-keep-getting-hotter

The oceans just keep getting hotter

Since 2018, a group of researchers from around the world has crunched the numbers on how much heat the world’s oceans are absorbing each year. In 2025, their measurements broke records once again, making this the eighth year in a row that the world’s oceans have absorbed more heat than in the years before.

The study, which was published Friday in the journal Advances in Atmospheric Science, found that the world’s oceans absorbed an additional 23 zettajoules’ worth of heat in 2025, the most in any year since modern measurements began in the 1960s. That’s significantly higher than the 16 additional zettajoules they absorbed in 2024. The research comes from a team of more than 50 scientists across the United States, Europe, and China.

A joule is a common way to measure energy. A single joule is a relatively small unit of measurement—it’s about enough to power a tiny lightbulb for a second, or slightly heat a gram of water. But a zettajoule is one sextillion joules; numerically, the 23 zettajoules the oceans absorbed this year can be written out as 23,000,000,000,000,000,000,000.

John Abraham, a professor of thermal science at the University of St. Thomas and one of the authors on the paper, says that he sometimes has trouble putting this number into contexts that laypeople understand. Abraham offers up a couple options. His favorite is comparing the energy stored in the ocean to the energy of atomic bombs: The 2025 warming, he says, is the energetic equivalent to 12 Hiroshima bombs exploding in the ocean. (Some other calculations he’s done include equating this number to the energy it would take to boil 2 billion Olympic swimming pools, or more than 200 times the electrical use of everyone on the planet.)

“Last year was a bonkers, crazy warming year—that’s the technical term,” Abraham joked to me. “The peer-reviewed scientific term is ‘bonkers’.”

The world’s oceans are its largest heat sink, absorbing more than 90 percent of the excess warming that is trapped in the atmosphere. While some of the excess heat warms the ocean’s surface, it also slowly travels further down into deeper parts of the ocean, aided by circulation and currents.

The oceans just keep getting hotter Read More »

nasa-orders-“controlled-medical-evacuation”-from-the-international-space-station

NASA orders “controlled medical evacuation” from the International Space Station


“The crew is highly trained, and they came to the aid of their colleague right away.”

The International Space Station orbits 260 miles (420 kilometers) above the Earth. Credit: NASA

NASA officials said Thursday they have decided to bring home four of the seven crew members on the International Space Station after one of them experienced a “medical situation” earlier this week.

The space agency has said little about the incident, and officials have not identified which crew member suffered the medical issue. James “JD” Polk, NASA’s chief health and medical officer, told reporters Thursday the crew member is “absolutely stable” but that the agency is “erring on the side of caution” with the decision to return the astronaut to Earth.

The ailing astronaut is part of the Crew-11 mission, which launched to the station August 1 and was slated to come back to Earth around February 20. Instead, the Crew-11 astronauts will depart the International Space Station (ISS) in the coming days and head for reentry and a parachute-assisted splashdown in the Pacific Ocean off the coast of California.

After discussions with our chief health and medical officer, Dr. JD Polk, and leadership across the agency, I’ve come to the decision that it’s in the best interests of our astronauts to return Crew-11 ahead of their planned departure,” NASA Administrator Jared Isaacman said Thursday.

The Crew-11 mission is led by commander Zena Cardman, 38, who is wrapping up her first mission to space. Second in command is pilot Mike Fincke, a 58-year-old astronaut on his fourth spaceflight. Japanese astronaut Kimiya Yui, 55, and Russian cosmonaut Oleg Platonov, 39, round out the crew.

Isaacman said NASA will release more information about the schedule for Crew-11’s undocking and reentry within the next 48 hours. The crew will come home aboard the same SpaceX Crew Dragon spacecraft they launched in more than five months ago. The entire crew must return to Earth together because they rely on the same Dragon spacecraft as a lifeboat.

“For over 60 years, NASA has set the standard for safety and security in crewed spaceflight,” Isaacman said. “In these endeavors, including the 25 years of continuous human presence onboard the International Space Station, the health and well-being of our astronauts is always and will be our highest priority.”

From left to right: Crew-11 mission specialist Oleg Platonov, pilot Mike Fincke, commander Zena Cardman, and mission specialist Kimiya Yui. This photo was taken during training at SpaceX’s facility in Hawthorne, California.

Credit: SpaceX

From left to right: Crew-11 mission specialist Oleg Platonov, pilot Mike Fincke, commander Zena Cardman, and mission specialist Kimiya Yui. This photo was taken during training at SpaceX’s facility in Hawthorne, California. Credit: SpaceX

Lingering risk

Polk, a physician who has served as NASA’s chief medical officer since 2016, said the agency is not ready to release details about the medical issue, citing privacy concerns. “I’m not going to speak about any particular astronaut or any particular specific diagnosis,” Polk said. “I’d ask that we still respect the privacy of the astronaut.”

Two of the Crew-11 astronauts, Cardman and Fincke, were preparing to head outside the space station on a spacewalk early Thursday. Spacewalk preps at the space station include a period of time breathing high concentrations of oxygen to purge nitrogen from the astronauts’ bloodstreams, a mitigation to avoid decompression sickness when crew members are sealed inside their spacesuits’ pure oxygen atmosphere.

Polk said whatever happened Wednesday “had nothing to do” with preparing for the spacewalk. “This was totally unrelated to any operations onboard,” he said. “It’s mostly having a medical issue in the difficult areas of microgravity with the suite of hardware that we have at our avail to complete a diagnosis.”

Yui radioed mission controllers in Houston on Wednesday afternoon requesting a private medical conference with a flight surgeon, then asked ground teams to turn on camera views inside the station ahead of the session. Medical sessions are carried out on private radio channels and are not heard on the regular communication loops between the space station and mission control. Those open loops are streamed around the clock online, but NASA removed the audio feed from YouTube soon after the crew asked for the medical conference.

NASA publicly revealed a medical concern with one of the astronauts later Wednesday afternoon, then announced late Wednesday night that officials were considering bringing the crew home early.

“I won’t go into specific details about the medical incident itself,” Polk said. “But the crew is highly trained, and they came to the aid of their colleague right away, and that’s part of why we do that training.”

The space station is stocked with medical gear and medications to help astronauts respond to emergencies. Crew members are trained to perform ultrasounds, defibrillate patients, and start IVs, among other things. The medical treatment available on the ISS is akin to what an EMT might provide in transit to a hospital, former astronaut Tom Marshburn, himself a medical doctor, said in 2021.

“We have a very robust suite of medical hardware onboard the International Space Station, but we don’t have the complete amount of hardware that I would have in the emergency department, for example, to complete the workup of a patient,” Polk said.

NASA Administrator Jared Isaacman, associate administrator Amit Kshatriya, and chief medical officer James “JD” Polk brief reporters on the status of the Crew-11 mission Thursday.

Credit: NASA/Joel Kowsky

NASA Administrator Jared Isaacman, associate administrator Amit Kshatriya, and chief medical officer James “JD” Polk brief reporters on the status of the Crew-11 mission Thursday. Credit: NASA/Joel Kowsky

Space station managers will take a few days to determine when the Dragon spacecraft will leave the station. SpaceX will dispatch a recovery ship from Southern California to sail for the splashdown zone in the Pacific, and officials will assess weather and sea conditions before selecting the best opportunity to depart the station. Like every crew return, the vessel will be staffed with medical personnel to examine the astronauts after exiting from the Dragon capsule.

“Because the astronaut is absolutely stable, this is not an emergent evacuation,” Polk said. “We’re not immediately disembarking and getting the astronaut down.”

But without a confirmed diagnosis of the astronaut’s medical issue, there’s some “lingering risk” for the astronaut’s health if they remained in orbit, Polk said. That’s why Isaacman and his deputies agreed to call an early end to the Crew-11 mission.

This was the most significant decision of Isaacman’s young tenure as NASA administrator. He was sworn in as NASA chief last month after clearing a confirmation vote in the Senate. Before taking the helm at NASA, Isaacman charted a career as an entrepreneur and private astronaut, flying to space twice on commercial missions with SpaceX.

An inevitability

After Crew-11’s departure, the space station will operate with a smaller crew of three until the arrival of SpaceX’s Crew-12 mission with a fresh team of astronauts next month. Isaacman said NASA and SpaceX are looking at options to move up the launch of Crew-12 from its current target date of February 15.

Until then, the station’s crew will consist of NASA astronaut Chris Williams and two Russian cosmonauts, who launched to the space station in November on a Russian Soyuz vehicle. Williams and his crewmates—Sergey Kud-Sverchkov and Sergey Mikayev—have their own lifeboat in the Soyuz spacecraft, so they will still have a ride home in the event of a future emergency.

The space station regularly operated with just three crew members for the first decade of its existence. The complex has been permanently staffed since 2000, sometimes with as few as two astronauts or cosmonauts. The standard crew size was raised to six in 2009, then to seven in 2020.

NASA astronaut Zena Cardman works with a spacesuit helmet inside the International Space Station’s airlock.

Credit: NASA

NASA astronaut Zena Cardman works with a spacesuit helmet inside the International Space Station’s airlock. Credit: NASA

Williams will be solely responsible for overseeing the lab’s US segment until Crew-12 arrives. He will be busy keeping up with maintenance tasks, so managers will likely defer some of the station’s scientific investigations until the complex is back to a full crew.

The early departure of Crew-11, leaving Williams as the only US astronaut aboard, also means NASA will be unable to perform spacewalks. This will mean a “slightly elevated risk” in NASA’s ability to respond to a major hardware failure that might require a spacewalk to fix, said Amit Kshatriya, the agency’s associate administrator.

NASA and the Russian space agency, Roscosmos, inked an agreement in 2022 to fly multinational crews on Dragon and Soyuz missions to ensure an American and a Russian are always at the space station. The so-called “seat swap” deal is proving worthwhile with this week’s events.

NASA has never before cut short a human spaceflight mission for medical reasons. “It’s the first time we’ve done a controlled medical evacuation from the vehicle, so that is unusual,” Kshatriya said.

The Soviet Union called an early end for an expedition to the Salyut 7 space station in 1985 after the mission’s commander fell ill in orbit.

In a sense, it is surprising that it took this long. Polk said predictive models suggested the ISS would have a medical evacuation about once every three years. It ended up taking 25 years. In that time, NASA has improved astronauts’ abilities to treat aches and pains, minor injuries, and routine illnesses.

Crews in orbit can now self-treat ailments that might have prompted a crew to return to Earth in the past. One astronaut was diagnosed with deep vein thrombosis, or a blood clot, in 2018 without requiring an early departure from the space station. Another astronaut suffered a pinched nerve in 2021 and remained in orbit for another seven months.

One of the more compelling reasons for the space station’s existence is its ability to act as a testbed for learning how to live and work off the planet. The station has served as a laboratory for studying how spaceflight affects the human body, and as a platform to test life support systems necessary for long-duration voyages to deep space.

“We are doing all this to continue to learn,” Isaacman said. “We will absolutely learn from this situation as well, to see if that informs our future on-orbit operations, whether that be on the space station or our future lunar base that we’re pursuing right now, and eventually for deep space missions to Mars.”

Photo of Stephen Clark

Stephen Clark is a space reporter at Ars Technica, covering private space companies and the world’s space agencies. Stephen writes about the nexus of technology, science, policy, and business on and off the planet.

NASA orders “controlled medical evacuation” from the International Space Station Read More »

these-60,000-year-old-poison-arrows-are-oldest-yet-found

These 60,000-year-old poison arrows are oldest yet found

Poisoned arrows or darts have long been used by cultures all over the world for hunting or warfare. For example, there are recipes for poisoning projective weapons, and deploying them in battle, in Greek and Roman historical documents, as well as references in Greek mythology and Homer’s Iliad and Odyssey. Chinese warriors over the ages did the same, as did the Gauls and Scythians, and some Native American populations.

Archaeologists have now found traces of a plant-based poison on several 60,000-year-old quartz Stone Age arrowheads found in South Africa, according to a new paper published in the journal Science Advances. That would make this the oldest direct evidence of using poisons on projectiles—a cognitively complex hunting strategy—and pushes the timeline for using poison arrows back into the Pleistocene.

The poisons commonly used could be derived from plants or animals (frogs, beetles, venomous lizards). Plant-based examples include curare, a muscle relaxant that paralyzes the victim’s respiratory system, causing death by asphyxiation. Oleander, milkweeds, or inee (onaye) contain cardiac glucosides. In Southeast Asia, the sap or juice of seeds from the ancar tree is smeared on arrowheads, which causes paralysis, convulsions, and cardiac arrest due to the presence of toxins like strychnine. Several species of aconite are known for their use as arrow poisons in Siberia and northern Japan.

According to the authors, up until now, the earliest direct evidence of poisoned arrows dates back to the mid-Holocene. For instance, scientists found traces of toxic glycoside residues on 4,000-year-old bone-tipped arrows recovered from an Egyptian tomb, as well as on bone arrow points from 6,700 years ago excavated from South Africa’s Kruger Cave. The only prior evidence of using poisons for hunting during the Pleistocene is a “poison applicator” found at Border Cave in South Africa, along with a lump of beeswax.

Milk of the poisonous onion

The authors sampled 10 quartz-backed arrowheads recovered from the Umhlatuzana Rock Shelter site in KwaZulu-Natal, South Africa. The results revealed that five of the 10 tested tips had traces of compounds found in Boophone disticha, aka gifbol (poisonous onion), sometimes called the century plant, which is common throughout South Africa. Various parts of the plant have been used as an analgesic (specifically a volatile oil called eugenol) as well as for poisonous hunting purposes. Its more toxic compounds include buphandrine, crinamidine, and buphanine; the latter is similar in effect to scopolamine and can cause hallucinations, coma, or death.

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these-dogs-eavesdrop-on-their-owners-to-learn-new-words

These dogs eavesdrop on their owners to learn new words

Next, the entire experiment was repeated with one key variation: This time, during the training protocol, rather than addressing the dogs directly when naming new toys, the dogs merely watched while their owners talked to another person while naming the toys, never directly addressing the dogs at all.

The result: 80 percent of the dogs correctly chose the toys in the direct address condition, and 100 percent did so in the overhearing condition. Taken together, the results demonstrate that GWL dogs can learn new object labels just by overhearing interactions, regardless of whether the dogs are active participants in the interactions or passive listeners—much like what has been observed in young children around a year-and-a-half old.

To learn whether temporal continuity (a nonsocial factor) or the lack thereof affects label learning in GWL dogs, the authors also devised a third experimental variation. The owner would show the dog a new toy, place it in a bucket, let the dog take the toy out of the bucket, and then place the toy back in. Then the owner would lift the bucket to prevent the dog from seeing what was inside and repeatedly use the toy name in a sentence while looking back and forth from the dog to the bucket. This was followed by the usual testing phase. The authors concluded that the dogs didn’t need temporal continuity to form object-label mappings. And when the same dogs were re-tested two weeks later, those mappings had not decayed; the dogs remembered.

But GWL dogs are extremely rare, and the findings don’t extend to typical dogs, as the group discovered when they ran both versions of the experiment using 10 non-GWL border collies. There was no evidence of actual learning in these typical dogs; the authors suggest their behavior reflects a doggy preference for novelty when it comes to toy selection, not the ability to learn object-label mappings.

“Our findings show that the socio-cognitive processes enabling word learning from overheard speech are not uniquely human,” said co-author Shany Dror of ELTE and VetMedUni universities. “Under the right conditions, some dogs present behaviors strikingly similar to those of young children. These dogs provide an exceptional model for exploring some of the cognitive abilities that enabled humans to develop language. But we do not suggest that all dogs learn in this way—far from it.”

Science, 2025. DOI: 10.1126/science.adq5474 (About DOIs).

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trump-withdraws-us-from-world’s-most-important-climate-treaty

Trump withdraws US from world’s most important climate treaty

The actual impact of the US withdrawal on many of the UN bodies singled out by Trump would depend on how aggressively his administration followed through on its announcement.

The head of one of the UN bodies named in the executive order said that the full effect of the move would become clear only during the UN’s annual budget allocation process.

“If they want to be difficult they could block the adoption of our budget. So it depends on how far they want to take it,” the person added.

Although the list caused anguish among environmental groups, it did not go as far as originally envisaged on trade and economic matters after the administration quietly dropped the World Trade Organization and the OECD from its list of potential targets last year.

In October, it emerged that Trump had authorized the payment of $25 million in overdue subscriptions to the WTO, despite the administration deriding the organization as “toothless” only a month previously.

The list also did not include the International Maritime Organization despite the Trump administration’s successful—and diplomatically bruising—move last year to block the IMO’s plan to introduce a net zero framework for shipping.

Sue Biniaz, the former US climate negotiator, said she hoped the retreat from the UNFCCC treaty was “a temporary one,” adding there were “multiple future pathways to rejoining the key climate agreements” in future.

Stiell of the UNFCCC agreed: “The doors remain open for the US to re-enter in the future, as it has in the past with the Paris Agreement. Meanwhile the size of the commercial opportunity in clean energy, climate resilience, and advanced electrotech remains too big for American investors and businesses to ignore.”

He added: “While all other nations are stepping forward together, this latest step back from global leadership, climate co-operation, and science can only harm the US economy, jobs, and living standards, as wildfires, floods, megastorms, and droughts get rapidly worse.”

© 2026 The Financial Times Ltd. All rights reserved Not to be redistributed, copied, or modified in any way.

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Japanese nuclear plant operator fabricated seismic risk data

On Wednesday, Japan’s Nuclear Regulation Authority announced that it is halting the relicensing process for two reactors at the Hamaoka plant after revelations that the plant’s chosen operator fabricated seismic hazard data. Japan has been slowly reactivating its extensive nuclear power plant collection after it was shut down following the Fukushima Daiichi disaster. The latest scandal is especially shocking, given that the Hamaoka plant is located on the coast near an active subduction fault—just as Fukushima Daiichi is.

A whistleblower reportedly alerted the Nuclear Regulation Authority in February of last year, but the issue became public this week when the regulators halted an evaluation process that could have led to a reactor restart at Hamaoka. This prompted the company that operates the plants, the Chubu Electric Power Co., to issue a press release describing in detail how the company manipulated the seismic safety data.

Based on an English translation, it appears that seismic risks were evaluated at least in part by scaling up the ground motion using data from smaller earthquakes. This is an inexact process, so the standard approach is to create a group of 20 different upscaled earthquake motions and find the one that best represents the average among the 20.

The company now acknowledges that since 2018, its staff has been generating large collections of upscaled earthquake scenarios, choosing one from among them, and then selecting another 19 so the average would make that event appear representative. The company does not mention how this process affected risk analysis, but it’s probably safe to assume that it was chosen specifically to make any risks seem more tolerable.

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new-battery-idea-gets-lots-of-power-out-of-unusual-sulfur-chemistry

New battery idea gets lots of power out of unusual sulfur chemistry

When the battery starts discharging, the sulfur at the cathode starts losing electrons and forming sulfur tetrachloride (SCl4), using chloride it stole from the electrolyte. As the electrons flow into the anode, they combine with the sodium, which plates onto the aluminum, forming a layer of sodium metal. Obviously, this wouldn’t work with an aqueous electrolyte, given how powerfully sodium reacts with water.

High capacity

To form a working battery, the researchers separated the two electrodes using a glass fiber material. They also added a porous carbon material to the cathode to keep the sulfur tetrachloride from diffusing into the electrolyte. They used various techniques to confirm that sodium was being deposited on the aluminum and that the reaction at the cathode was occurring via sulfur dichloride intermediates. They also determined that sodium chloride was a poor source of sodium ions, as it tended to precipitate out onto some of the solid materials in the battery.

The battery was also fairly stable, surviving 1,400 cycles before suffering significant capacity decay. Higher charging rates caused capacity to decay more quickly, but the battery did a great job of holding a charge, maintaining over 95 percent, even when idled for 400 days.

While the researchers provide some capacity-per-weight measurements, they don’t do so for a complete battery, focusing instead on portions of the battery, such as the sulfur or the total electrode mass.

But with both electrodes considered, the energy density can reach over 2,000 Watt-hours per kilogram. While that will undoubtedly drop with the total mass of the battery, it’s difficult to imagine that it wouldn’t outperform existing sodium-sulfur or sodium-ion batteries.

Beyond the capacity, the big benefit of the proposed system appears to be its price. Given the raw materials, the researchers estimate that their cost is roughly $5 per kilowatt-hour of capacity, which is less than a tenth of the cost of current sodium batteries.

Again, there’s no guarantee that this work can be scaled up for manufacturing in a way that keeps it competitive with current technologies. Still, if the materials used in existing battery technologies become expensive, it’s reassuring to have other options.

Nature, 2026. DOI: 10.1038/s41586-025-09867-2  (About DOIs).

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