The Cyberspace Administration of China (CAC) released a draft for soliciting opinions on management of cybersecurity incident reporting on Friday. The draft specifies that the theft of national security information should be recognized as a severe cybersecurity incident, and those who fail to report it as required will be subject to punishment.
According to the CAC, the document is intended to standardize the reporting of cybersecurity incidents and reduce the losses and damage caused by such incidents, so as to safeguard national cybersecurity.
The document clarifies that operators should promptly initiate emergency response plans to deal with network security incidents. Based on the guidelines for the classification of network security incidents, those considered large, severe, or extremely severe incidents should be reported within one hour.
According to the guidelines, if important networks and information systems suffer from particularly severe system losses, resulting in widespread system paralysis and loss of business processing capabilities, it is considered an extremely severe network security incident.
This classification also includes a situation in which state secret information, important sensitive information, and important data is lost or stolen, tampered with or counterfeited, posing a particularly serious threat to national security and social stability.
Other events that pose serious threats to national security, social order, economic development, and public interests are also considered to be extremely severe network security incidents.
Specifically, if provincial-level and above Party and government portal websites or key news websites cannot be accessed for more than 24 hours due to attacks or malfunctions, or if the overall operation of critical information infrastructure is interrupted for more than six hours or the main functions are interrupted for more than 24 hours, it can generally be identified as an extremely severe cybersecurity incident.
If the event affects the work and lives of more than 30 percent of the population in a single provincial-level administrative region, or affects the use of water, electricity, gas, oil, heating, or transportation of more than 10 million people, it also falls into this category.
Additionally, the guidelines specify that if the incident leads to the leakage of personal information of more than 100 million people or causes direct economic losses of more than 100 million yuan ($14 million), it will also be considered an extremely severe cybersecurity incident.
The draft for comment of the document shows that the governance of network security in China has entered an important stage of high-quality development, Qin An, deputy director of the expert committee of counter-terrorism and cyber security governance at the China Society of Police Law, told the Global Times on Friday.
Qin noted that the classification of network security incidents by severity level is a highlight of the document, as it allows for the categorization of incidents based on their urgency and importance. "The classification resolves some of the confusion that may arise during actual implementation," he said.
According to the CAC, if the operator delays reporting, falsely reports, or conceals a cybersecurity incident, resulting in significant harmful consequences, the operator and relevant responsible individuals shall be severely punished according to the law.
"The implementation of relevant punitive measures is crucial to ensure the effective enforcement of laws and to safeguard national security," the expert said.
According to the CAC, when encountering a cybersecurity incident, an operator should report the name of the unit where the incident happens and basic information about the facilities, systems, and platforms involved, as well as the time, location, type of event, and the impact and harm caused.
Additionally, the document states that the report should include the measures that have been taken and their effectiveness, the development trend of the situation, potential further impact and harm, and preliminary analysis of the causes of the incident.
With the name Temple of Heaven, an artwork jointly created by Chinese contemporary artist Zou Cao and “isolated elders,” or elderly people who have no family, has recently been finished and revealed to the public.
The art piece took Zou and his partners two months to create. There are 10 different versions of the art prints. The main subject of the prints is the Temple of Heaven, which was built in Beijing in the Ming Dynasty (1368-1644).
Taking a close look at the art, one can see the architecture has been depicted with thousands of overlapping fingerprints. Compared to figurative paintings, the architecture looks slightly surreal, yet the artwork’s purpose is to be close to reality as Zou wanted to reconnect the marginalized “isolated elders” group with mainstream society.
“These elderly people are not just a community that needs to be helped. The idea of ‘everyone joins in the public welfare project’ can be achieved when the elderly participate in the whole art-making process,” Zou told the Global Times.
The art practice was originated as a charity program that was launched by the Tencent Foundation. The program is called “grandparent companionship project.” It offers support including food and companionship for 10,000 elderly people across the country.
The idea for the artwork came from the fingerprints some elderly people left on their letters sent to the program’s volunteers.
“I’ve been thinking about what I can do for the old people,” the artist told the Global Times and he added that the gap between fine art and society can be closed.
The art piece of Temple of Heaven reflects a trending artistic topic that is called “socially engaged art,” art critic and museum expert Li Liyang told the Global Times.
“This art form tries to make a response to what happens in society and everyday life. It is not just about changing the context but also reveals an artist’s longing and their focus on life practices,” Li told the Global Times.
The prints will be auctioned and all the benefits will be donated to the elderly people.
“I made the whole project into a ‘social sculpture,’ using artistic methods to change society based on what I, as an artist, can do,” Zou told the Global Times.
A research forum that relates to this artistic practice has also been carried out. Veteran TV host Jing Yidan said that ageing is always a sore point of societies. The public should pay more attention not only to elderly people without families, but also other elderly groups such as people who have lost their children.
Yu Yang, a famous art critic, said that Zou's fingerprint painting was different to his previous works. There is a genre transformation in turning the “prints” to “performance art,” Yu noted.
“Fingerprints are a symbol of contact in traditional Chinese culture. We can also interpret this as a commitment of the artist to his social responsibility,” Yu said.
Physicists have snagged a bounty of five new particles in one go.
Members of the LHCb experiment, located at the Large Hadron Collider near Geneva, reported the prolific particle procurement in a paper posted online March 14 at arXiv.org. The five particles are each composed of three quarks — a class of particle that makes up larger particles such as protons and neutrons. Each of the new particles comprises two “strange” quarks and one “charm” quark.
The five particles are in various excited, or high-energy, states — giving each particle a different mass and a different arrangement of quarks within. Such particles are expected to exist according to the theory of the strong nuclear force, which bundles quarks together into larger particles.
The five excited particles are named after their low-energy relative, Ωc0 or omega-c-zero. Their rather uninspiring monikers are Ωc(3000)0, Ωc(3050) 0, Ωc(3066) 0, Ωc(3090) 0 and Ωc(3119) 0. Each number in parentheses indicates the mass of the particle in millions of electron volts.
Nomadic warriors and herders known as the Huns are described in historical accounts as having instigated the fifth century fall of the Roman Empire under Attila’s leadership. But the invaders weren’t always so fierce. Sometimes they shared rather than fought with the Romans, new evidence suggests.
Huns and farmers living around the Roman Empire’s eastern border, where the Danube River runs through present-day Hungary, borrowed ways of life from each other during the fifth century, say archaeologist Susanne Hakenbeck of the University of Cambridge and colleagues. Nomadic Huns on the Roman frontier raised relatively small numbers of animals and grew some crops, while border-zone farmers incorporated more meat into what had been a wheat- and vegetable-heavy diet, the scientists report March 22 in PLOS ONE. “Our data show that the dietary strategies of the people on both sides of the Roman frontier were not fundamentally different,” Hakenbeck says.
Their findings challenge a traditional view of the Huns as marauders who roamed hundreds of kilometers from Central Asia to Europe. There’s no evidence of major social upheavals or a geographically distinctive group of newcomers at the frontier sites, so at least some Huns may have been homegrown, Hakenbeck suggests. Rapidly forming groups of Hun warriors and herders on horseback could have emerged in southeastern Europe not far from the Roman Empire’s border, perhaps supplemented by nomadic newcomers from farther east near the Black Sea, she proposes.
Still, geographic origins of the Huns are tough to pin down, says archaeologist Ursula Brosseder of the University of Bonn in Germany. The Huns developed as a political movement that picked up members from various ethnic groups as it spread, she explains. Brosseder suspects the “Hun phenomenon” formed on the grasslands of Western Eurasia, a territory that includes regions cited by Hakenbeck. The earliest evidence of Huns in that region dates to about 2,400 years ago. The new study supports the idea that herding communities adapted flexibly to new environments, sometimes relying only on their livestock and at other times farming to varying extents, Brosseder says. Nomadic herders in Asia probably cultivated millet, a fast-growing cereal that can be used to feed people and horses, Hakenbeck says. Her group studied skeletons of 234 people buried at five previously excavated sites on or near the Roman frontier. Each site contained evidence of contact with Huns, including bronze artifacts and adult skulls with elongated braincases created by binding the head during childhood. Reasons for this practice are poorly understood. It may have signified affiliation with the Huns or social status of some kind.
Graves at a Roman fort and a nearby cemetery lay on Roman land, about 150 kilometers from the frontier. Another two cemeteries were situated on the banks of the Danube River, directly on the Roman frontier. A final graveyard fell outside Roman territory. It was located about 150 kilometers east of the border.
Measurements of ratios of specific forms of carbon, nitrogen and oxygen in teeth and ribs enabled the scientists to identify what types of plants and how much meat or milk individuals ate during childhood, early adulthood and toward the end of their lives.
Results pointed to considerable consumption of cultivated plants, most likely millet, as well as meat or milk at all five sites. Variations on this general pattern occurred across sites and among individuals at each site, suggesting that groups and individuals rapidly adjusted how much they farmed or herded as circumstances dictated. “This mixing and matching was likely a kind of economic insurance policy in violent and unstable times,” Hakenbeck says.
Hakenbeck’s group also measured another tooth element, strontium, to determine whether individuals at four of the sites had grown up drinking water and eating food in the locales where they were buried. Between 30 and 50 percent of individuals studied at those sites weren’t locals, and the birthplaces of these people remain a mystery, Hakenbeck says.
In many cases, both newcomers and natives to the Roman frontier substantially changed their eating habits over the course of their lives, the researchers find. That fits Hakenbeck’s “mix and match” scenario, in which a fluctuating diet aided survival on the empire’s edge.
A common and usually harmless virus may trigger celiac disease. Infection with the suspected culprit, a reovirus, could cause the immune system to react to gluten as if it was a dangerous pathogen instead of a harmless food protein, an international team of researchers reports April 7 in Science.
In a study in mice, the researchers found that the reovirus, T1L, tricks the immune system into mounting an attack against innocent food molecules. The virus first blocks the immune system’s regulatory response that usually gives non-native substances, like food proteins, the OK, Terence Dermody, a virologist at the University of Pittsburgh, and colleagues found. Then the virus prompts a harmful inflammatory response. “Viruses have been suspected as potential triggers of autoimmune or food allergy–related diseases for decades,” says Herbert Virgin, a viral immunologist at Washington University School of Medicine in St. Louis. This study provides new data on how a viral infection can change the immune system’s response to food, says Virgin, who wasn’t involved in the study.
Reoviruses aren’t deadly. Almost everyone has been infected with a reovirus, and almost no one gets sick, Dermody says. But if the first exposure to a food with gluten occurs during infection, the virus may turn the immune system against the food protein, the researchers found.
The immune system can either allow foreign substances, such as food proteins, to pass through the body peacefully, or it can go on the attack. In people with celiac disease, gluten is treated like a harmful pathogen; the immune system response damages the lining of the small intestine, causing symptoms like bloody diarrhea.
Celiac disease has been associated with two genetic features. Though 30 to 40 percent of people in the United States have one or both of these features, only 1 percent of the population has been diagnosed with the disease. This disparity suggests that some environmental factor triggers it.
Dermody and colleagues found that the T1L reovirus may be a trigger. In mice engineered to have one of those genetic features, the virus appeared to trick the immune system into seeing gluten as an enemy. The key interaction occurs in the mesenteric lymph nodes, where gluten meets up with dendritic cells, which are like the “orchestra conductors” of the immune system, Dermody says. These cells dictate whether the immune system ignores a substance or mounts a defense against it.
But the virus engages with the dendritic cells as well, fooling the cells into thinking that gluten, like the virus, is in some way dangerous. And then the immune system attacks the gluten.
Dermody and colleagues also found that the reovirus stimulated activity of an enzyme called tissue transglutaminase. In people with celiac disease, the enzyme makes gluten more able to trigger a harmful immune system response.
Celiac patients also had higher levels of reovirus antibodies than those found in people without the disease.
Dermody doesn’t think that the T1L reovirus is the only virus that can stimulate celiac disease. Future research will analyze the potential of other viruses and also determine whether T1L is a true trigger of the disease in humans. If it is, then a reovirus vaccine could be developed for at-risk children, which could potentially block the development of celiac disease, “and that would be pretty amazing,” Dermody says.
Pregnant women who do not have enough folic acid — a B vitamin — in their bodies can pass the deficiency on to their unborn children. It may lead to retarded growth and congenital malformation, according to Dr. A. Leonard Luhby…. “Folic acid deficiency in pregnant women could well constitute a public health problem of dimensions we have not originally recognized,” he says. — Science News. December 9, 1967
Update Folic acid — or folate — can prevent brain and spinal cord defects in developing fetuses. Since the U.S. Food and Drug Administration required that all enriched grain products contain the vitamin starting in 1998, birth defects have been prevented in about 1,300 babies each year. But some women still don’t get enough folate, while others may be overdoing it. About 10 percent of women may ingest more than the upper limit of 1,000 micrograms daily — about 2.5 times the recommended amount, a 2011 study found. Too much folate may increase a woman’s risk for certain cancers and interfere with some epilepsy drugs.
Immediately after a 19-year-old shot and killed 17 people and wounded 17 others at a Florida high school on Valentine’s Day, people leaped to explain what had caused the latest mass slaughter.
By now, it’s a familiar drill: Too many readily available guns. Too much untreated mental illness. Too much warped masculinity. Don’t forget those shoot-’em-up video games and movies. Add (or repeat, with voice raised) your own favorite here.
Now the national debate has received an invigorated dose of activism. Inspired by students from the targeted Florida high school, as many as 500,000 people are expected to rally against gun violence and in favor of stricter gun laws on March 24 in Washington, D.C., with sister marches taking place in cities across the world. But a big problem haunts the justifiable outrage over massacres of innocents going about their daily affairs: Whatever we think we know about school shootings, or mass public shootings in general, is either sheer speculation or wrong. A science of mass shootings doesn’t exist.
“There is little good research on what are probably a host of problems contributing to mass violence,” says criminologist Grant Duwe of the Minnesota Department of Corrections in St. Paul. Duwe has spent more than two decades combing through federal crime records and newspaper accounts to track trends in mass killings. Perhaps this dearth of data is no surprise. Research on any kind of gun violence gets little federal funding (SN Online: 3/9/18; SN: 5/14/16, p. 16). Criminologist James Alan Fox of Northeastern University in Boston has argued for more than 20 years that crime researchers mostly ignore mass shootings. Some of these researchers assume that whatever causes people to commit any form of murder explains mass shootings. Others regard mass killings as driven by severe mental disorders, thus falling outside the realm of crime studies.
When a research vacuum on a matter of public safety meets a 24-hour news cycle juiced up on national anguish, a thousand speculations bloom. “Everybody’s an expert on this issue, but we’re relying on anecdotes,” says sociologist Michael Rocque of Bates College in Lewiston, Maine.
Rocque and Duwe published a review of what’s known about reasons for mass public shootings, sometimes called rampage shootings, in the February Current Opinion in Psychology. Their conclusion: not much. Scientific ignorance on this issue is especially concerning given that Rocque and Duwe describe a slight, but not unprecedented, recent uptick in the national rate of rampage shootings. Shooting stats Defining mass public shootings to track their frequency is tricky. A consensus among researchers is emerging that these events occur in public places, include at least four people killed by gunshots within a 24-hour period and are not part of a robbery or any other separate crime, Rocque and Duwe say. Such incidents include workplace and school shootings. Overall, mass public shootings are rare, Duwe says, though intense media coverage may suggest the opposite. Even less obvious is that rampage shootings have been occurring for at least 100 years.
Using Federal Bureau of Investigation homicide reports, Congressional Research Service data on mass shootings and online archives of news accounts about multiple murders, Duwe has tracked U.S. rates of mass public shootings from 1915 to 2017.
He has identified a total of 185 such events through 2017, 150 of which have occurred since 1966. (In 2016, he published results up to 2013 in the Wiley Handbook of the Psychology of Mass Shootings.) In the earliest known case, from 1915, a Georgia man shot five people dead in the street, after killing an attorney he blamed for financial losses, and wounded 32 others. Another lawyer, who came to the crime scene upon hearing gunshots and was wounded by a bullet, ended the rampage when he grabbed a pistol from a hardware store and killed the shooter.
What stands out more than a century later is that, contrary to popular opinion, mass public shooting rates have not ballooned to record highs. While the average rate of these crimes has increased since 2005, it’s currently no greater than rates for some earlier periods. Crime trends are usually calculated as rates per 100,000 people for, say, robberies and assaults. But because of the small number of mass public shootings, Duwe calculates annual rates per 100 million people in the United States.
The average annual rate of mass public shootings since 2010 is about 1.44 per 100 million people. That roughly equals the 1990s rate of 1.41, Duwe finds.
The average annual rate from 1988 to 1993 reached 1.52, about the same as the 1.51 rate from 2007 to 2012. After dropping to just below 1 per 100 million people in 2013 and 2014, rates increased to nearly 1.3 the next three years.
From 1994 to 2004, rates mostly hovered around 1 per 100 million people or below, but spiked to over 2.5 in 1999. That’s the year two teens killed 13 people at Columbine High School in Colorado.
In contrast, rates were minuscule from 1950 to 1965, when only three mass public shootings were recorded. The average annual rate for 1970 to 1979 reached 0.52, based on 13 mass public shootings.
Numbers of people killed and wounded per shooting incident have risen in the last decade, though. Two events in 2012 were particularly horrific. Shootings at a movie theater in Aurora, Colo., and an elementary school in Newtown, Conn., resulted in 40 murders, many of children, and 60 nonfatal gunshot wounds. Whether this trend reflects an increasing use of guns with large-capacity magazines or other factors “is up for grabs,” Duwe says. The unknowns No good evidence exists that either limiting or loosening gun access would reduce mass shootings, Rocque says. Virtually no research has examined whether a federal ban on assault weapons from 1994 to 2004 contributed to the relatively low rate of mass public shootings during that period. The same questions apply to concealed-carry laws, promoted as a way to deter rampage killers. As a gun owner and longtime hunter in his home state of Maine, Rocque calls for “an evidence-based movement” to establish links between gun laws and trends in mass shootings.
Mental illness also demands closer scrutiny, Duwe says. Of 160 mass public shooters from 1915 to 2013, about 60 percent had been assigned a psychiatric diagnosis or had shown signs of serious mental illness before the attack, Duwe has found. In general, mental illness is not linked to becoming violent. But, he says, many mass shooters are tormented and paranoid individuals who want to end their painful lives after evening the score with those they feel have wronged them.
Masculinity also regularly gets raised as a contributor to mass public shootings. It’s a plausible idea, since males committed all but one of the tragedies in Duwe’s review. Sociologist Michael Kimmel of Stony Brook University in New York contends that a sense of wounded masculinity as a result of various life failures inspires rage and even violence. But researchers have yet to examine how any facet of masculinity plays into school or workplace shootings, Rocque says.
Although school shooters often report feeling a desperate need to make up for having been inadequate as men, many factors contribute to their actions, argues clinical psychologist Peter Langman. Based in Allentown, Pa., Langman has interviewed and profiled several dozen school shooters in the United States and other countries. He divides perpetrators into three psychological categories: psychopathic (lacking empathy and concern for others), psychotic (experiencing paranoid delusions, hearing voices and having poor social skills) and traumatized (coming from families marked by drug addiction, sexual abuse and other severe problems).
But only a few of the millions of people who qualify for those categories translate their personal demons into killing sprees. Any formula to tag mass shooters in the making will inevitably round up lots of people who would never pose a deadly threat.
“There is no good evidence on what differentiates a bitter, aggrieved man from a bitter, aggrieved and dangerous man,” says psychologist Benjamin Winegard of Carroll College in Helena, Mont.
Nor does any published evidence support claims that being a bully or a victim of bullying, or watching violent video games and movies, leads to mass public shootings, Winegard contends. Bullying affects a disturbingly high proportion of youngsters and has been linked to later anxiety and depression (SN: 5/30/15, p. 12) but not to later violence. In laboratory studies, youngsters who play violent computer games or watch violent videos generally don’t become more aggressive or violent in experimental situations. Investigators have found that some school shooters, including the Newtown perpetrator, preferred playing nonviolent video games, Winegard says.
He and a colleague presented this evidence in the Wiley Handbook of the Psychology of Mass Shootings. Northeastern’s Fox also coauthored a chapter in that publication.
Still, a small but tragic group of kids lead lives that somehow turn them into killers of classmates or random strangers (SN: 5/27/06, p. 328). If some precise mix of, say, early brain damage, social ineptitude, paranoia and fury over life’s unfair twists cooks up mass killers, scientists don’t know the toxic recipe. And it won’t be easy to come up with one given the small number of mass public shooters to study.
Duwe recommends that researchers first do a better job of documenting the backgrounds of individual mass shooters and any events or experiences that may have precipitated their deadly actions. Then investigators can address broader social influences on mass shootings, including gun legislation and media coverage.
But more than a century after a distraught Georgia man mowed down six of his fellow citizens, research on mass violence still takes a backseat to public fear and outrage. “If we’re bemoaning the state of research,” Duwe says, “we have no one to blame but ourselves.”
Black holes have been beguiling from the very beginning.
Hinted at as early as the 1780s and predicted by Einstein’s general theory of relativity, they didn’t get the name we know today until the 1960s. Bizarre beasts that squash gobs of matter into infinitely dense abysses, black holes were once thought to be merely a mathematical curiosity.
But astronomers tallied up evidence for black holes’ existence bit by bit, puzzling over where these behemoths live, how they gulp down matter and what their existence means for other physics theories.
For more than a decade, a team of researchers has been engrossed in an ambitious effort to snap a picture of a black hole for the very first time. And now they’ve done it. What better time to think back to black holes’ origins and the journey so far?
Even as some parts of West Antarctica rapidly melt, raising sea level, large swaths of the ice remain stable for the time being. Scientists have now explored one of those stable spots — an isolated nook where the ocean meets the ice. There, the team found the underside of the ice sculpted into strange grooves, ripples and globes. This environment is “really at the edge” between melting and freezing, says planetary scientist Justin Lawrence. The delicate balance between these two processes is shaping the ice into those strange textures — similar to the way that minerals dissolve and recrystallize to form the beautiful shapes inside limestone caverns. The result, at Kamb Ice Stream, is that massive cracks in the underside of the ice appear to be freezing back together as the beach ball–sized globes fill in the crevasses from above, Lawrence and colleagues report March 2 in Nature Geoscience. This refreezing differs from what’s happening at Antarctica’s Thwaites Glacier. There, scientists recently reported that these cracks, known as basal crevasses, are instead sites of rapid melting (SN: 2/15/23). Understanding what is happening at Kamb will help scientists predict how large parts of the Antarctic coastline that are not currently vulnerable might respond as the world continues to warm due to human-caused climate change. Here’s what’s different about Kamb. Supercold water underlies the ice at Kamb, slowing melting In December 2019, two teams of researchers from New Zealand and the United States visited the Kamb Ice Stream — a type of glacier that consists of a channel of faster-moving ice surrounded by slower ice. Kamb, like much of the rest of the West Antarctic Ice Sheet, rests on a bed that is hundreds of meters below sea level. The New Zealand team used hot water to melt a narrow hole through the ice, just downstream of the “grounding zone,” where the glacier lifts off its muddy bed and floats on the ocean. The U.S. team then lowered a remote-operated vehicle called Icefin down through 580 meters of ice and into the seawater below. The researchers piloted Icefin as far as a kilometer from the borehole, navigating by video transmitted up through a cable. At the time of the expedition, the team operating Icefin was affiliated with Georgia Tech in Atlanta, but has since moved to Cornell University, except for Lawrence. He now works for Honeybee Robotics, a private company in Altadena, Calif. Icefin found that much of the seawater beneath Kamb is about 0.3 degrees Celsius above freezing. But directly below the ice sits a colder layer, a mixture of seawater and glacial meltwater just 0.02 to 0.08 degrees C above freezing. Based on these measurements, Lawrence and his colleagues estimate that the exposed underside of Kamb is melting about 26 centimeters per year. In contrast, recent measurements at the increasingly unstable Thwaites Glacier, about 1,400 kilometers to the northeast, found the seawater at the glacier’s grounding zone 1 to 2 degrees C warmer than at Kamb — and the ice melting 5 to 40 meters per year. The new finding at Kamb makes sense, says New Zealand team member Christina Hulbe, of the University of Otago, because the seabed at Kamb is relatively shallow. So it is not exposed to the deep, warm ocean currents that are hitting Thwaites. Much of Antarctica is fringed by cold ocean environments similar to Kamb, she says. “So just understanding that system is important.” Greenish globs of refrozen ice fill cracks at Kamb As Icefin glided along, its sonars detected massive basal crevasses up to 55 meters across in the ice above. These cracks probably formed as the floating part of the glacier, the ice shelf, flexes up and down with ocean tides. Lawrence and his colleagues guided the ROV into one of these cracks, and found its white, icy sidewalls carved into narrow vertical grooves. Icefin ascended 40 meters up, until the grooves suddenly vanished — replaced by a jumble of ice globes, which seemed to fill the upper half of the crevasse. The globes were greenish — a hue often seen in winter ice that forms on the surface of the ocean. This color makes Lawrence and his colleagues think that the globes form from the ultracold mixture of seawater and meltwater that circulates up into a crack and refreezes, gradually filling in the crack, from the top down, over many decades. They think that this is happening in all of the crevasses they observed. “These crevasses are effectively healing themselves,” he says. This refreezing process might also explain the strange vertical grooves in the walls of the crevasse, Lawrence speculates. As the water freezes, salt is pushed out of the newly forming ice crystals, creating tiny pockets of highly concentrated brine. That dense brine streams down the walls, melting grooves into the ice — similar to the way that salt causes ice to melt when it’s sprinkled onto a sidewalk in the wintertime. To observe the crevasses refreezing under Kamb “is pretty exceptional,” says Ginny Catania, a glaciologist at the University of Texas at Austin who was not part of the project. Those cracks “can propagate all the way to the surface and cause calving” of icebergs, she says, which can shrink the ice shelf if it happens too quickly, destabilizing the glacier and raising sea level. But if the crevasses can actually heal, this could make these ice shelves more resistant to calving — and more stable — than scientists realized, at least as long as the ice continues to be bathed in cold water on the underside. A string of instruments installed in the hole continued to measure the temperature and salinity of the water beneath the ice — transmitting that data up a cable to the ice’s surface, and back home via satellite until the batteries ran out two years later. Those data show that conditions down below remained cool and comfortable for Kamb.
A surprise ingredient may explain how lemon juice puts the squeeze on kidney stones.
Lemons contain nanoparticles that, when fed to rats, block stone formation, scientists report in the Feb. 22 Nano Letters. If the tiny sacs do the same for humans, the nanoparticles might one day offer a way to prevent kidney stones in people, says pharmaceutical scientist Hongzhi Qiao of Nanjing University of Chinese Medicine.
Lemon juice is a well-known home remedy for kidney stones, which form when minerals crystalize and clump up inside the kidney (SN: 9/21/18). These rocky lumps can knock around in the urinary tract, slicing and dicing tissues as they eventually pass out of the body (SN: 10/31/16). “It’s so, so, so painful,” says Jingyin Yan, a nephrologist at Baylor College of Medicine in Houston who was not part of the new study. Patients may feel sharp pain in their back, side or lower abdomen when they pass a stone, she says. “People describe it as worse than delivering a baby.” Though some medications can help treat kidney stones, many people end up needing surgery to remove them, says Thomas Chi, a urologist at the University of California, San Francisco, also not part of the study. People often imagine kidney stones as tiny pebbles, but sometimes they bulk up like boulders, he adds. “I’ve taken out stones the size of your fist.”
That’s why prevention is key. Scientists already knew that citric acid, which gives lemons their sour power, may do the trick by binding to the minerals that make up stones. But drinking mouth-puckering lemon juice is not so comfortable for patients, Qiao says.
A 2022 clinical trial found that kidney stone patients had trouble downing 120 milliliters — about a half cup — of lemon juice per day. Swilling loads of lemonade can cause dental problems, too. Chi has had patients drink so much that the acidic liquid ate away at their teeth.
So Qiao and colleagues looked for other, more palatable lemon-derived ingredients that might help prevent kidney stones. Inside edible and medicinal plants like ginseng, grapefruit and dandelion, his team has found extracellular vesicle-like nanoparticles, tiny sacs stuffed with molecules including fat, protein and DNA. These nanoparticles exist in lemon juice, too — and the team fed them to rats that had also ingested a substance that promotes kidney stone growth. The zesty particles slowed stone formation, Qiao and colleagues found. The finding suggests these particles curb development of calcium oxalate crystals, the most common culprit of kidney stones. The particles can also soften the stones and make them less sticky, the team showed.
The new work challenges the conventional wisdom on how lemon juice works to combat kidney stones, Chi says. Using lemon nanoparticles to treat people is still a long way off, but the team’s results hold promise, he says. “The faster you can bring a finding like this towards a human clinical trial, the better.”