The Pentagon downed an unidentified object over Alaska on Thursday night at the order of President Biden, according to a U.S. official. From a report: The U.S. official said it was not confirmed if the object was a balloon, but it was traveling at an altitude that made it a potential threat to civilian aircraft. Mr. Biden ordered the unidentified object downed "out of an abundance of caution," the official said. The action comes less than a week after a U.S. fighter jet shot down a Chinese spy balloon that had traversed the United States, according to three American officials. The latest breach, officials said, took place Thursday night, over Alaska. One official described it as a "fast-moving" situation that was still developing. It is not clear if the object was from an adversarial power, or a commercial or research operation that has gone astray, the official said.

China has cut its participation in an internet cable project to link Asia with Europe, as tensions grow between Washington and Beijing over control of the physical infrastructure that transmits the world's online traffic. From a report: Two of China's biggest telecoms groups, China Telecom and China Mobile, withdrew their combined investment of roughly 20 per cent from the subsea cable project last year after a US company was selected to build the line over Hengtong Marine, the country's biggest provider in the sector, according to three people briefed on the decision.

Their exit from the Sea-Me-We 6 pipeline -- which is estimated to cost around $500mn to lay 19,200km of cables connecting south-east Asia to western Europe -- highlights the growing battle between China and the US over who builds and owns the infrastructure underpinning the global internet. The departure of China Mobile and China Telecom is an indication of intensifying tensions between Washington and Beijing, according to industry figures with knowledge of the project. Another member of the consortium described their involvement as "important but not critical."

An anonymous reader quotes a report from Ars Technica: Amazon's Kuiper division can start launching satellites to offer broadband service in the US, the Federal Communications Commission said yesterday. The FCC's International Bureau approved Kuiper's orbital debris mitigation plan. This approval was needed to satisfy a condition imposed in 2020 when the Amazon subsidiary received tentative approval for a network of 3,236 satellites in low-Earth orbit. "Our action will allow Kuiper to begin deployment of its constellation in order to bring high-speed broadband connectivity to customers around the world," yesterday's FCC order said.

Amazon's biggest competitor for low-latency satellite broadband will be SpaceX's Starlink service, but Amazon's launch schedule puts it a few years behind SpaceX. The companies have fought each other in FCC proceedings, with Amazon objecting to SpaceX's satellite plans and SpaceX filing objections to Amazon's. In approving Amazon's plan yesterday, the FCC dismissed objections from other satellite providers such as SpaceX and Viasat. As the FCC order notes, SpaceX argued that the commission "should limit Kuiper to deploy only 578 satellites in its 630 kilometer orbital shell, and defer action regarding the remainder of the constellation," in order to "address Kuiper's ability to coexist with other systems in and around its 590 kilometer and 610 kilometer shells, and allow for 'continued monitoring' of deployment." A Space filing last month said, "Granting an initial 578 satellites of Amazon's 3,236-satellite system would offer Amazon a path to begin deploying for 'many months,' while providing the Commission with time and additional data to assess the serious issues raised in this proceeding." [...]

According to the FCC, SpaceX also argued "that Kuiper's satellite disposal strategy will place the Kuiper satellites in an elliptical orbit that, because of the variable effects of atmospheric drag on orbit evolution, will result in large uncertainties in the predicted trajectories of the Kuiper satellites, making it difficult for other operators to assess and mitigate risk." SpaceX contended that "the large covariances involved in the elliptical orbits may therefore pose a risk to SpaceX's satellites operating at the same altitudes during their orbit raising phase of operations." However, Kuiper responded that it "will perform orbit determination using Global Positioning System (GPS) measurements on all Kuiper satellites during the deorbiting process and share high-accuracy location information with operators on a real-time basis." The FCC accepted that plan and imposed it as a condition on the license. SpaceX and Viasat both "raised concerns that Kuiper's satellite designs are not sufficiently finalized to enable review," but Amazon said the design is complete and that it doesn't expect material changes, the FCC order said. Kuiper would have to apply for a license modification if it does make significant changes.

The alleged Chinese spy balloon that flew over the US was capable of collecting communications signals and was part of a broader People's Liberation Army intelligence-gathering effort that spanned more than 40 countries, a State Department official said Thursday. From a report: High-resolution imagery provided by U-2 spy planes that flew past the balloon revealed an array of surveillance equipment that was inconsistent with Beijing's claim that it was a weather device blown off course, the official said in a statement provided on condition of anonymity. The statement, released before State and Defense Department officials appeared before Congress in open hearings and closed briefings on Thursday, marks the fullest accounting yet for the Biden administration's insistence over the course of a week-long drama that the balloon was meant to spy on the US. Defense Secretary Lloyd Austin said in an interview with CBS News that the Pentagon acted to limit what the balloon could learn about US nuclear capabilities.

Matthew Hillier can't get Comcast service at his home in Arvada, Colorado. But that didn't stop Comcast from claiming it serves his house when it submitted data for the Federal Communications Commission's new broadband map. From a report: Comcast eventually admitted to the FCC that it doesn't serve the address -- but only after Ars got involved. Comcast will have to correct its submission for Hillier's house, and a bigger correction might be needed because it appears Comcast doesn't serve dozens of other nearby homes that it claimed as part of its coverage area.

When Hillier looked up his address on the FCC map, it showed Comcast claims to offer 1.2Gbps download and 35Mbps upload speeds at the house. In reality, he makes do with CenturyLink Internet that tops out at 60Mbps downloads and 5Mbps uploads. Hillier -- an engineer with 30 years experience who previously worked for several telecom firms, including Comcast and Charter -- submitted a challenge to the FCC in mid-November, telling the commission that Comcast doesn't serve his address. Correcting false data is important because the map will be used to determine which parts of the US are eligible for $42.45 billion in federal grants to expand broadband availability. Program rules require ISPs to respond to challenges within 60 days, and Comcast's first response to Hillier's insisted that it actually does serve the house, which is on a street called Quartz Loop. "The provider subject to your challenge has disputed your challenge," the FCC told Hillier in an automated email on January 21. Comcast admitted to the FCC that it doesn't offer service at Hillier's home in Arvada on February 3, one day after Ars contacted Comcast's public relations department.

Slashdot reader lexios shares this report from the French international news agency Agence France-Press: European police arrested 42 suspects and seized guns, drugs and millions in cash, after cracking another encrypted online messaging service used by criminals, Dutch law enforcement said Friday. Police launched raids on 79 premises in Belgium, Germany and the Netherlands following an investigation that started back in September 2020 and led to the shutting down of the covert Exclu Messenger service.

After police and prosecutors got into the Exclu secret communications system, they were able to read the messages passed between criminals for five months before the raids, said Dutch police. Those arrested include users of the app, as well as its owners and controllers. Police in France, Italy and Sweden, as well as Europol and Eurojust, its justice agency twin, also took part in the investigation. The police raids uncovered at least two drugs labs, one cocaine-processing facility, several kilograms of drugs, four million euros in cash, luxury goods and guns, Dutch police said.
The "secure" messaging app was used by around 3 000 people who paid 800 euros (roughly $866 USD) for a six-month subscription.

Ryan Grewell, who runs a small wireless Internet service provider in Ohio, last month received an email that confirmed some of his worst suspicions about cable companies. From a report: Grewell, founder and general manager of Smart Way Communications, had heard from some of his customers that the Federal Communications Commission's new broadband map falsely claimed fiber Internet service was available at their homes from another company called Jefferson County Cable. Those customer reports spurred Grewell to submit a number of challenges to the FCC in an attempt to correct errors in Smart Way's service area.

One of Grewell's challenges elicited a response from Jefferson County Cable executive Bob Loveridge, who apparently thought Grewell was a resident at the challenged address rather than a competitor. "You challenged that we do not have service at your residence and indeed we don't today," Loveridge wrote in a January 9 email that Grewell shared with Ars. "With our huge investment in upgrading our service to provide xgpon we reported to the BDC [Broadband Data Collection] that we have service at your residence so that they would not allocate addition [sic] broadband expansion money over [the] top of our private investment in our plant."

The email is reminiscent of our November 2022 article about a cable company accidentally telling a rival about its plan to block government grants to competitors. Speaking to Ars in a phone interview, Grewell said, "This cable company happened to just say the quiet part out loud." He called it "a blatant attempt at blocking anyone else from getting funding in an area they intend to serve." It's not clear when Jefferson County Cable plans to serve the area. Program rules do not allow ISPs to claim future coverage in their map submissions. Jefferson County Cable ultimately admitted to the FCC that it filed incorrect data and was required to submit a correction. The challenge that the ISP conceded was for an address on State Route 43 in Bergholz, Ohio. The town is not one of the coverage areas listed on Jefferson County Cable's website.

The European Union is weighing a proposal to make technology companies that use the most bandwidth, like Netflix and Alphabet, to help pay for the next generation of internet infrastructure, according to a draft document seen by Bloomberg. From the report: The suggestions are part of a "fair-share" vision from the EU's executive arm that could require large tech businesses, which provide streaming videos and other data-heavy services, to help pay for the traffic they generate.

The draft document, which is part of a consultation with the industry, suggested firms might contribute to a fund to offset the cost of building 5G mobile networks and fiber infrastructure, as well as the creation of a mandatory system of direct payments from tech giants to telecom operators. The commission also asked companies whether there should be a threshold that would qualify a company to be a "large traffic generator," the document showed. That could be similar to the European governing body's rules designating some tech companies "gatekeepers" and "very large online platforms" in its recent competition and online content rules.

Satellite navigation systems for lunar settlements will require local atomic clocks. Scientists are working out what time they will keep. From a report: It's not obvious what form a universal lunar time would take. Clocks on Earth and the Moon naturally tick at different speeds, because of the differing gravitational fields of the two bodies. Official lunar time could be based on a clock system designed to synchronize with UTC, or it could be independent of Earth time. Representatives of space agencies and academic organizations worldwide met in November 2022 to start drafting recommendations on how to define lunar time at the European Space Research and Technology Centre of the European Space Agency (ESA) in Noordwijk, the Netherlands.

Decisions must be made soon, says Patrizia Tavella, who leads the time department at the International Bureau of Weights and Measures in Sevres, France. If an official lunar time is not established, space agencies and private companies will come up with their own solutions, she says. "This is why we want to raise an alert now, saying let's work together to take a common decision." The most pressing need for lunar time comes from plans to create a dedicated global satellite navigation system (GNSS) for the Moon, similar to how GPS and other satellite navigation networks enable precise location tracking on Earth.

Space agencies plan to install this lunar GNSS from around 2030. ESA approved a lunar satellite navigation project called Moonlight at its ministerial council meeting on 22 and 23 November 2022 in Paris, and NASA established a similar project, called Lunar Communications Relay and Navigation Systems, last January. Until now, Moon missions have pinpointed their locations using radio signals sent to large antennas on Earth at scheduled times. But with dozens of missions planned, "there's just not enough resources to cover everybody," says Joel Parker, an engineer who works on lunar navigation at the Goddard Center.

The New York City Department of Correction wants to stop incarcerated people from receiving physical mail inside city jails. From a report: The department, known as DOC, said the proposed changes are part of an effort to increase safety in the jail system by cracking down on illegal contraband following the deaths of 19 people last year at Rikers Island, the city's jail complex. Several of the people died from apparent drug overdoses, including at least one from fentanyl.

The main source of contraband inside city jails, though, has been corrections staff, not mail, critics of the policy change said. Instead, the move to scrap physical mail opens the door to private firms to set up surveillance systems against incarcerated people. City officials and advocates are concerned about an apparent plan to contract with a company called Securus -- a leading provider of phone calling systems for prisons and jails with a controversial past -- to digitize detainees' mail and make it available to searches.

"Contractors are explicitly advertising unprecedented surveillance," said Stephanie Krent, a staff attorney at the Knight First Amendment Institute at Columbia University, speaking about firms like Securus that specialize in prison communications. "That's surveillance that's going to fall most harshly on marginalized communities." The proposed changes follow a nationwide trend of prisons and jails moving to stop incarcerated people from receiving physical mail. Prisons in Pennsylvania stopped physical mail in 2018, and prisons in Massachusetts started sending incarcerated people photocopies of original letters. Last year, prisons in New Mexico and Florida adopted similar changes, and Texas has also limited in-person mail. There is little evidence that those changes have stopped the flow of drugs, the Vera Institute wrote in a March report: "With no evidence that these bans improve security, it's only the for-profit contractors that stand to benefit from these arrangements."

The world's largest rail vehicle manufacturer has rolled out a zero-emissions train running on hydrogen fuel cells with a supercapacitor buffer. The four-car train is capable of 100 mph (160 km/h), making it the fastest hydrogen train to date. New Atlas reports: Jointly developed by state-owned industrial monolith CRRC and Chengdu Rail Transit, this is China's first hydrogen-powered passenger train, offering a range of 373 miles (600 km), and emitting nothing but water. It's capable of self-driving, with 5G communications, automatic wake-up, start and stop, and return to depot functionality. Germany is ahead on this kind of thing, with some 14 hydrogen-fueled Alstom trains already in service as of last year. The CRRC machine can beat the German trains for speed by around 20 km/h (12 mph), but the German trains currently offer a much greater range at ~620 miles (1,000 km). According to Information Trends, there are just over 1,000 hydrogen stations in the world -- one-third of them being in China.

Why hasn't America restored net neutrality protections? "President Biden's nomination to serve on the Federal Communications Commission has been stalled in the Senate for more than a year," complain the editorial boards of two Silicon Valley newspapers: Confirming Gigi Sohn would end the 2-2 deadlock on the FCC that is keeping Biden from fulfilling his campaign promise to restore net neutrality, ensuring that all internet traffic is treated equally. Polls show that 75% of Americans support net neutrality rules. They know that an open internet is essential for innovation and economic growth, for fostering the next generation of entrepreneurs....

[T]elecommunication giants such as AT&T, Verizon and Comcast don't want that to happen. They favor the status quo that allows the internet companies to pick winners and losers by charging content providers higher rates for speedier access to customers. They seek to expand the cable system model and allow kingmakers to rake in billions at the expense of smaller, new startups that struggle to gain a wider audience on their slow-speed offerings. So Republicans and a handful of Democrats are holding up Sohn's confirmation, claiming that her "radical" views disqualify her....

They also object to Sohn's current service as an Electronic Frontier Foundation board member, saying it proves she wouldn't be an unbiased and impartial FCC Commissioner. The San Francisco-based EFF is a leading nonprofit with a mission of defending digital privacy, free speech and innovation....

Enough is enough. Confirm Sohn and allow the FCC to fulfill its mission of promoting connectivity and ensuring a robust and competitive internet market.

The U.S. Nuclear Regulatory Commission has certified the design for what will be the United States' first small modular nuclear reactor. The Associated Press reports: The rule that certifies the design was published Thursday in the Federal Register. It means that companies seeking to build and operate a nuclear power plant can pick the design for a 50-megawatt, advanced light-water small modular nuclear reactor by Oregon-based NuScale Power and apply to the NRC for a license. It's the final determination that the design is acceptable for use, so it can't be legally challenged during the licensing process when someone applies to build and operate a nuclear power plant, NRC spokesperson Scott Burnell said Friday. The rule becomes effective in late February.

The U.S. Energy Department said the newly approved design "equips the nation with a new clean power source to help drive down" planet-warming greenhouse gas emissions. It's the seventh nuclear reactor design cleared for use in the United States. The rest are for traditional, large, light-water reactors. Diane Hughes, NuScale's vice president of marketing and communications, said the design certification is a historic step forward toward a clean energy future and makes the company's VOYGR power plant a near-term deployable solution for customers. The first small modular reactor design application package included over 2 million pages of supporting materials, Hughes added. "NuScale has also applied to the NRC for approval of a larger design, at 77 megawatts per module, and the agency is checking the application for completeness before starting a full review," adds the report.

An anonymous reader quotes a report from Ars Technica: Over the past few days, dozens of tech companies have filed briefs in support of Google in a Supreme Court case that tests online platforms' liability for recommending content. Obvious stakeholders like Meta and Twitter, alongside popular platforms like Craigslist, Etsy, Wikipedia, Roblox, and Tripadvisor, urged the court to uphold Section 230 immunity in the case or risk muddying the paths users rely on to connect with each other and discover information online. Out of all these briefs, however, Reddit's was perhaps the most persuasive (PDF). The platform argued on behalf of everyday Internet users, whom it claims could be buried in "frivolous" lawsuits for frequenting Reddit, if Section 230 is weakened by the court. Unlike other companies that hire content moderators, the content that Reddit displays is "primarily driven by humans -- not by centralized algorithms." Because of this, Reddit's brief paints a picture of trolls suing not major social media companies, but individuals who get no compensation for their work recommending content in communities. That legal threat extends to both volunteer content moderators, Reddit argued, as well as more casual users who collect Reddit "karma" by upvoting and downvoting posts to help surface the most engaging content in their communities.

"Section 230 of the Communications Decency Act famously protects Internet platforms from liability, yet what's missing from the discussion is that it crucially protects Internet users -- everyday people -- when they participate in moderation like removing unwanted content from their communities, or users upvoting and downvoting posts," a Reddit spokesperson told Ars. Reddit argues in the brief that such frivolous lawsuits have been lobbed against Reddit users and the company in the past, and Section 230 protections historically have consistently allowed Reddit users to "quickly and inexpensively" avoid litigation. [...]

The Supreme Court will have to weigh whether Reddit's arguments are valid. To help make its case defending Section 230 immunity protections for recommending content, Reddit received special permission from the Supreme Court to include anonymous comments from Reddit mods in its brief. This, Reddit's spokesperson notes, is "a significant departure from normal Supreme Court procedure." The Electronic Frontier Foundation, a nonprofit defending online privacy, championed the court's decision to allow moderators to contribute comments anonymously. "We're happy the Supreme Court recognized the First Amendment rights of Reddit moderators to speak to the court about their concerns," EFF's senior staff attorney, Sophia Cope, told Ars. "It is quite understandable why those individuals may be hesitant to identify themselves should they be subject to liability in the future for moderating others' speech on Reddit."

"Reddit users that interact with third-party content -- including 'hosting' content on a sub-Reddit that they manage, or moderating that content -- could definitely be open to legal exposure if the Court carves out "recommending' from Section 230's protections, or otherwise narrows Section 230's reach," Cope told Ars.

Karl Bode, reporting for TechDirt: Recently, New York State passed a new law demanding that regional broadband providers (Verizon, Charter Spectrum, and Altice) provide low-income consumers $15, 25 Mbps broadband tiers to help them survive COVID. The goal: to try and help struggling Americans afford the high cost of broadband during an historic health crisis. Under the proposal ISPs are also allowed to offer $20, 200 Mbps tiers, with any price increases capped at two percent per year. U.S. Regulators engaging in anything even close to price regulation of regional monopolies is, again, said monopolies' worst nightmare.

As a result, the broadband industry quickly sued New York, insisting that the state is forbidden from passing such a law thanks in part to the Trump administration's net neutrality repeal (which basically attempted to lobotomize state consumer protection authority in addition to killing popular net neutrality rules). As the case heads to court, it could have broader implications for other state efforts to mandate lower costs for consumers (in times of crisis or not): "The industry fear is that other states might impose requirements far more onerous than what New York requires, such as by further lowering the price, raising the speed requirements, or expanding the eligibility pool to make broadband affordable for middle-class customers," added Levin.

A wide range of businesses, internet users, academics and even human rights experts defended Big Tech's liability shield in a pivotal Supreme Court case about YouTube algorithms, with some arguing that excluding AI-driven recommendation engines from federal legal protections would cause sweeping changes to the open internet. From a report: The diverse group weighing in at the Court ranged from major tech companies such as Meta, Twitter and Microsoft to some of Big Tech's most vocal critics, including Yelp and the Electronic Frontier Foundation. Even Reddit and a collection of volunteer Reddit moderators got involved. In friend-of-the-court filings, the companies, organizations and individuals said the federal law whose scope the Court could potentially narrow in the case -- Section 230 of the Communications Decency Act -- is vital to the basic function of the web. Section 230 has been used to shield all websites, not just social media platforms, from lawsuits over third-party content.

The question at the heart of the case, Gonzalez v. Google, is whether Google can be sued for recommending pro-ISIS content to users through its YouTube algorithm; the company has argued that Section 230 precludes such litigation. But the plaintiffs in the case, the family members of a person killed in a 2015 ISIS attack in Paris, have argued that YouTube's recommendation algorithm can be held liable under a US antiterrorism law. In their filing, Reddit and the Reddit moderators argued that a ruling enabling litigation against tech-industry algorithms could lead to future lawsuits against even non-algorithmic forms of recommendation, and potentially targeted lawsuits against individual internet users.

An anonymous reader quotes a report from Phys.Org: The ultraviolet nail polish drying devices used to cure gel manicures may pose more of a public health concern than previously thought. Researchers at the University of California San Diego have studied these ultraviolet (UV) light emitting devices, and found that their use leads to cell death and cancer-causing mutations in human cells. The devices are a common fixture in nail salons, and generally use a particular spectrum of UV light (340-395nm) to cure the chemicals used in gel manicures. While tanning beds use a different spectrum of UV light (280-400nm) that studies have conclusively proven to be carcinogenic, the spectrum used in the nail dryers has not been well studied.

Using three different cell lines -- adult human skin keratinocytes, human foreskin fibroblasts, and mouse embryonic fibroblasts -- the researchers found that the use of these UV emitting devices for just one 20-minute session led to between 20 and 30 percent cell death, while three consecutive 20-minute exposures caused between 65 and 70 percent of the exposed cells to die. Exposure to the UV light also caused mitochondrial and DNA damage in the remaining cells and resulted in mutations with patterns that can be observed in skin cancer in humans. [...] The researchers caution that while the results show the harmful effects of the repeated use of these devices on human cells, a long-term epidemiological study would be required before stating conclusively that using these machines leads to an increased risk of skin cancers. However, the results of the study were clear: The chronic use of these nail polish drying machines is damaging to human cells. "We saw multiple things: first, we saw that DNA gets damaged," said Ludmil Alexandrov, a professor of bioengineering as well as cellular and molecular medicine at UC San Diego, and corresponding author of the study published in Nature Communications. "We also saw that some of the DNA damage does not get repaired over time, and it does lead to mutations after every exposure with a UV-nail polish dryer. Lastly, we saw that exposure may cause mitochondrial dysfunction, which may also result in additional mutations. We looked at patients with skin cancers, and we see the exact same patterns of mutations in these patients that were seen in the irradiated cells."

"Our experimental results and the prior evidence strongly suggest that radiation emitted by UV-nail polish dryers may cause cancers of the hand and that UV-nail polish dryers, similar to tanning beds, may increase the risk of early-onset skin cancer," add the researchers. "Nevertheless, future large-scale epidemiological studies are warranted to accurately quantify the risk for skin cancer of the hand in people regularly using UV-nail polish dryers. It is likely that such studies will take at least a decade to complete and to subsequently inform the general public."

The U.S. State Department is going sans serif: It has directed staff at home and overseas to phase out the Times New Roman font and adopt Calibri in official communications and memos, in a bid to help employees who are visually impaired or have other difficulties reading. From a report: In a cable sent Tuesday and obtained by The Washington Post, Secretary of State Antony Blinken directed the department to use a larger sans-serif font in high-level internal documents, and gave the department's domestic and overseas offices until Feb. 6 to "adopt Calibri as the standard font for all requested papers."

"The Times (New Roman) are a-Changin," read the subject line. Blinken's cable said the shift to Calibri will make it easier for people with disabilities who use certain assistive technologies, such as screen readers, to read department communication. The change was recommended by the secretary's office of diversity and inclusion, but the decision has already ruffled feathers among aesthetic-conscious employees who have been typing in Times New Roman for years in cables and memos from far-flung embassies and consulates around the world. "A colleague of mine called it sacrilege," said a Foreign Service officer in Asia, who like others spoke on the condition of anonymity to discuss internal policy changes. "I don't mind the decision because I hate serifs, but I don't love Calibri."

fahrbot-bot shares a report from Engadget: Lightning rods have been used to safely guide strikes into the ground since Benjamin Franklin's day, but their short range (roughly the same radius as the height) and fixed-in-place design makes them ineffective for protecting large areas. The technology may finally be here to replace them in some situations. European researchers have successfully tested a system that uses terawatt-level laser pulses to steer lighting toward a 26-foot rod. It's not limited by its physical height, and can cover much wider areas -- in this case, 590 feet -- while penetrating clouds and fog.

["The experiment was performed on Santis Mountain, in northeast Switzerland," adds The Washington Post. "A 407-foot (124-meter) communications tower there, equipped with a lightning rod, is struck roughly a hundred times a year."] The design ionizes nitrogen and oxygen molecules, releasing electrons and creating a plasma that conducts electricity. As the laser fires at a very quick 1,000 pulses per second, it's considerably more likely to intercept lightning as it forms. In the test, conducted between June and September 2021, lightning followed the beam for nearly 197 feet before hitting the rod. The findings have been published in the journal Nature Photonics. A video of the work has also been published on YouTube.

Russia's attacks on Ukraine's electrical grid are straining the war-torn country's mobile-telephone network, leading to a global hunt for batteries and other equipment critical for keeping the communications system working. From a report: Ukraine's power outages aren't just putting out the lights. The electricity shortages also affect water supplies, heating systems, manufacturing and the cellular-telephone and internet network, a vital communications link in a nation where fixed-line telephones are uncommon. Consumers can charge their cellphones at cafes or gas stations with generators, but the phones have to communicate with base stations whose antennas and switching equipment need large amounts of power. With rolling blackouts now a regular feature of life in Ukraine, the internet providers are relying on batteries to keep the network going.

The stakes are high, since Ukrainian officials are using positive news of the war, speeches by President Volodymyr Zelensky and videos distributed by cellphone to maintain popular support for fighting Russia. First responders and evacuees rely on the mobile network, and a long-term loss of communications in major cities would compound the existing problems of electrical, heating and water outages, the companies say. Labor shortages have exacerbated the mobile-network issues as many Ukrainians have been displaced by the war or gone to the front to fight. In December, the chief executive of Ukraine's Lifecell mobile operator, Ismet Yazici, went into the field himself to wheel in a generator and restore backup power at a cell tower, according to the company. But the biggest problem is power equipment.