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  • Pakistan’s ability to thread the needle in relations with the US and Iran tested by the Israel-Iran war

    Pakistan’s ability to thread the needle in relations with the US and Iran tested by the Israel-Iran war

    The announcement of a cease-fire between Iran and Israel, after 12 days of war, was met with relief in Pakistan. As tensions escalated between the two archrivals, particularly following the June 21 US airstrikes on Iranian nuclear facilities, Pakistan’s geopolitical importance suddenly increased. Both Tehran and Washington expected Islamabad to side with their respective positions. The United States hoped to have Pakistan’s understanding of its decision to use force to destroy Iran’s nuclear enrichment program. Whereas Iran counted on Pakistan to stand with it against Israeli and American efforts to deny it the right to pursue what it continues to claim is a peaceful energy policy. This situation placed the Pakistani government in a politically sensitive and diplomatically delicate position. On the one hand, it was in the process of strengthening its strategic ties with the US. On the other, it did not wish to abandon the principle of supporting the self-determination of a neighboring Muslim country. Also, an attack that could destabilize Iran left the possibility of triggering a severe crisis within Pakistan. Terrorist groups already active in the restive Balochistan region, which straddles Iran and Pakistan’s shared border, could exploit the chaos, escalate attacks, and attempt to take control of ungoverned or weakened frontier areas.

    Despite all these concerns, the long-running Iran-Israel conflict had never posed such a significant domestic challenge for Pakistan’s civil-military establishment as it did this time. Just a day before the US strike, Pakistan had nominated President Donald Trump for the 2026 Nobel Peace Prize, citing his “decisive diplomatic intervention and pivotal leadership” during the recent four-day war between India and Pakistan. The timing could not have been worse, and a wide range of political voices in Pakistan criticized the civil-military establishment for appearing to appease the US and abandoning a neighboring Muslim country just as one was attacking the other. However, without delay, the Pakistani government condemned the strikes, calling them “deeply disturbing” and a breach of international norms. The Foreign Office added its grave concern about the potential for further escalation, and Prime Minister Shehbaz Sharif phoned Iranian President Masoud Pezeshkian to affirm Pakistan’s support.

    But Islamabad’s backing was clearly measured. Ignoring domestic pressure to provide Iran with security assistance, Islamabad limited its response to the attacks to rhetorical and symbolic support. In truth, while in recent years there has been a relaxation in bilateral relations between Iran and several of its neighbors, presumably no state in the region welcomes the prospects of a nuclear-armed Iran, and some leaders are privately thought to be supportive of US actions. Public criticisms appear aimed mainly at managing domestic public opinion and preserving diplomatic options.

    Most recently, Secretary of State Marco Rubio held a call with Prime Minister Sharif, during which both agreed to work together to achieve a durable peace between Iran and Israel. Meanwhile, Iran’s military chief, Maj. Gen. Abdolrahim Mousavi, called Pakistan’s Army head, Field Marshal Asim Munir, to thank Pakistan for taking a courageous stance and supporting Iran during its 12-day war with Israel. Pakistan’s ability to simultaneously maintain constructive ties with Iran and the US places it in a strategically important position to bridge divides and serve as a credible mediator between the two.

    Pakistan is skilled in threading such diplomatic needles. Over the past several decades, it successfully preserved a balanced relationship with deep rivals Iran and Saudi Arabia, and it managed to remain on friendly terms with often mutually antagonistic Arab states. For a period of 20 years, its governments facilitated US military operations in Afghanistan while also keeping faith with its client Afghan insurgents. Pakistan also resisted without seeming to outright reject the idea that its nuclear program should be treated as an Islamic one. As US-China relations have become more contentious in recent years, Islamabad, which won plaudits for its role in the 1971 reproachment, has demonstrated its diplomatic skills in avoiding having to choose sides.

    Strongly negative sentiment in Pakistan toward the United States has long been ingrained into popular attitudes, fueled in recent years by the political opposition’s various anti-American conspiracy theories and spiked most recently by a US alignment with Israel’s policies in Gaza. Through it all, however, civil-military authorities in Islamabad have worked to normalize as much as possible their relationship with Washington. The government had visibly chafed under the policies of President Joe Biden’s administration, which had marginalized Pakistan as a regional actor and narrowly defined bilateral relations. Many in the country took special umbrage over Biden’s refusal to establish personal contact with Pakistan’s civilian leadership. Only lingering US concerns over the resurgence of global terrorism in the region seemed to have kept Pakistan on Washington’s radar.

    In contrast, President Donald Trump’s administration is seen as offering a fresh start for US-Pakistani relations. Islamabad was delighted to hear the president single out Pakistan for praise in his April 2025 address before a joint session of the US Congress for its contribution to nabbing a high-value terrorist. Leaning on Trump’s comments, many in the Pakistani government and military envisioned a US administration now ready to take an active role in resolving the Kashmir dispute. Others expressed optimism that the US would use its assumed influence over the International Monetary Fund (IMF) to soften the IMF’s strict demands on Pakistan. Moreover, some hoped that with Biden gone, Pakistan would now be free of the years of hectoring the US had subjected it to about its human rights record and democratic practices.

    Trump’s foreign policy agenda — whose success he tends to measure by the extent of secured international transactions that aggrandize American national interests — has only slightly dimmed Pakistani expectations of a warmer relationship with Washington. Pakistan has been hit with the threat of high tariffs and travel restrictions. But thus far, it has reacted calmly and obligingly offered the US rare mineral concessions along with investment opportunities. Pakistan’s brief war with India last May also ended up indirectly furthering the improvement in ties with the US: the government in Islamabad was pleased at being treated by American mediators as equals with New Delhi. While India refuses to acknowledge a US role in ending the conflict, Pakistan has heaped praise on Trump, Rubio, and others.

    A striking indication of the changed atmosphere was provided several days before the American bombing raid on Iran with the visit to Washington by Field Marshal Munir, effectively the most powerful figure in Pakistan. Munir was greeted warmly at the Pentagon by top brass and rewarded with a private lunch meeting with the US president. His visit came on the heels of a Pakistani diplomatic delegation that had successful meetings with officials at the State Department, seeking to shape Pakistan’s narrative of the recent four-day war with India. Those trips became a visible embarrassment, however, with the onset of the US armed intervention in Iran. Munir and the governing coalition suffered a political setback on which opposition elements quickly sought to capitalize. The more recent cease-fire between Iran and Israel brokered by Trump, on the other hand, seems to have offered a reprieve for Pakistan’s civil-military establishment.

    The latest warming of relations between the United States and Pakistan may require a fuller explanation than can be understood in transactional terms. Seen against the background of intensifying American engagement in the Middle East and South Asia, as witnessed over the last several months, Washington may be grooming Pakistan to once more assume the close regional security partner role it played in the US’s Cold War alliance containment policy, the defeat of the Soviet Union in Afghanistan, and over the course of the post-2001 counter-insurgency campaign against the Afghan Taliban. In a region marked by ongoing volatility and intensifying great power competition, Pakistan could have much to offer the US: not only is it the Greater Middle East’s most populous Muslim country but also boasts its largest and most formidable military and is the Islamic world’s sole nuclear power. The Iran-Israel conflict thrust Pakistan back into the global spotlight, exacerbating the many foreign policy challenges it already faces. It remains to be seen how Pakistan will handle the complex and shifting international landscape.

     

    Marvin G. Weinbaum is a Senior Fellow at the Middle East Institute, focusing on Afghanistan and Pakistan. He is a professor emeritus of political science at the University of Illinois at Urbana-Champaign and served as analyst for Pakistan and Afghanistan in the US Department of State’s Bureau of Intelligence and Research from 1999 to 2003.

    Naade Ali is currently serving as a Research Assistant to Dr. Weinbaum at MEI. He has more than five years of involvement working with international organizations and think tanks as a political researcher, policy advisor, peace strategist, and human rights practitioner with experience in human and national security, democratization, conflict resolution, and political culture. Prior to joining MEI, Ali worked with Media Foundation 360, a think tank dedicated to strengthening democratic practices in Pakistan.

    Photo by AAMIR QURESHI/AFP via Getty Images





    The Middle East Institute (MEI) is an independent, non-partisan, non-for-profit, educational organization. It does not engage in advocacy and its scholars’ opinions are their own. MEI welcomes financial donations, but retains sole editorial control over its work and its publications reflect only the authors’ views. For a listing of MEI donors, please click here.

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  • 25 children, driver injured after school van plunges into ravine in AJK

    25 children, driver injured after school van plunges into ravine in AJK

    Outside view of District Headquarters (DHQ) Hospital Hattian Bala, in AJK. — Reporter
    • Children taken to DHQ Hospital Hattian Bala, THQ Hospital Chikar.
    • Van driver, two children in critical condition: SP Mirza Zahid.
    • Accident occurs near Chikar hill station in Neelum Valley.

    MUZAFFARABAD: At least 25 schoolchildren and a driver sustained injuries after a van fell into a gorge near Chikar hill station in the Azad Jammu and Kashmir’s (AJK) Neelum Valley.

    The AJK police said that the injured children and van driver were shifted to the hospital. According to the Superintendent Police (SP) Mirza Zahid, the van driver and two children are in critical condition.

    The affected children were taken to the DHQ Hospital Hattian Bala and Tehsil Headquarters (THQ) Hospital Chikar.

    Road accidents are common in the country’s mountainous regions, largely due to poor driving skills, lack of safety measures, challenging terrain, and derelict road infrastructure.

    Buses and trucks are normally filled beyond their capacities with passengers which also cause vehicles to overturn.

    In May, five policemen including Assistant Director Zakir Awan and IG’s Reader Ali Bukhari died in a horrific accident after their car fell into a ravine in Azad Jammu and Kashmir’s Dhirkot tehsil.

    The incident took place in Lasdana, a tourist destination in AJK’s Bagh district, in which five cops lost their lives. Policemen Fahim, SHO Naveed and Inspector Yasir Kiani were also among the deceased, according to Bagh deputy commissioner.

    According to official statistics, traffic accidents in Pakistan dropped by over 33% in 2024 if compared with 2023.

    A total of 6,233 traffic accidents took place countrywide in 2024 among which 4,231 were fatal traffic accidents. In 2023, a total number of 9,333 road accidents took place across the country among which 3,820 were fatal traffic accidents.

    In Azad Jammu Kashmir, 409 road accidents were reported among which 111 were fatal accidents and 298 were non-fatal accidents. In 2023, AJK reported a total of 391 road accidents where 115 were fatal and 276 were non-fatal accidents.


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  • Game-changer Stephen Jacobs retires after 30 years

    Game-changer Stephen Jacobs retires after 30 years

    After three decades of teaching, mentoring, and pioneering academic and research programs at RIT, Professor Stephen Jacobs is retiring.

    Jacobs worked as an adjunct faculty member in English and computing before becoming a full-time professor in 1995. As a video game expert, he taught courses in game programming and game design/narrative. Together with former faculty members Andy Phelps and Jeff Lasky, Jacobs wrote the proposal for RIT’s master’s degree in game design and development. Today, RIT’s games degrees are regularly ranked among the top 10 in the country.

    With RIT’s MAGIC Spell Studios, Jacobs served as one of the original associate directors—focusing on industry relations. He collaborated to produce MAGIC’s first game on the Nintendo Switch platform, called The Original Mobile Games—a partnership with The Strong National Museum of Play and Second Avenue Learning.

    Jacobs has also served as a steward for all things FOSS (free and open source software) at RIT. He helped create courses and programs on the subject and served as director of the Open@RIT research center.

    “I’m not a traditional academic,” said Jacobs. “It’s been a pleasure to spend the last 30 years as an RIT professor.”

    Below, Jacobs shares reflections from his time at RIT.

    What has your long-term partnership with The Strong National Museum of Play meant to you?

    I’ve been a Scholar-in-Residence since 2007. In that role, I’ve been able to serve as a member of exhibit design teams, co-create an online course in game design history that was nominated by students for an edX award as a best course, and help bring conferences to Rochester—like the upcoming 2025 Conference on BIPOC Games Studies. That kind of work, over the years, led to a Tourism Achievement Award from Visit Rochester.

    We also enjoy bringing classes to The Strong every year. This year the “final exam” for my History and Design of Pinball class was to demo their analog and digital games at The Strong as part of a museum-wide pinball day we co-organized. I’ve also been working with them around my research on the Jewish History of the Toy and Games Industries in Germany and the U.S, which we’re developing into an exhibit for 2026.

    Why do you champion open source for social good?

    I was attracted to this world through the One Laptop Per Child initiative. They were providing low-cost laptops to children in developing countries. In 2009, I created an honors seminar for our students to make educational games for the One Laptop Per Child community.

    Over 16 years that initial course grew into an immersion focusing on humanitarian open software development and an interdisciplinary minor—the only one of its kind in the world. It also led to our Open@RIT center to support faculty, staff, and students’ Open research and work. That center had us lead several workshops, join the Linux Foundation, and receive more than $1 million in awards to support its work over four years.  I received the Provost’s Excellence in Faculty Mentoring Award in 2019-2020 (in part for this work) and the PI Millionaire award in 2023 for grants from the Alfred P. Sloan Foundation.

    How have you encouraged students to make lifelong connections outside the classroom?

    Video games are an international industry, and it’s important to have international experiences on your résumé.

    I began teaching travel-enhanced courses—ones that meet on-campus for a semester with international travel before or after the on-campus work—in 2014.  These courses established a model of spending a week in one town (in Paderborn, Germany for this one), holding a game jam over the weekend with the German students (a weekend-long, video game creating marathon), and then traveling elsewhere in country for a week to visit cultural sites and game studios. I taught this again in 2017 and 2019.

    In 2018, I replicated the Germany model in Japan. We worked with Ritsumeikan University and the Kyoto Computer Gakuin, a long-time partner with RIT in international education. This year, in addition to the course’s regular visits to the CyberConnect2 video game studio and Hiroshima, we were able to attend World Expo in Osaka. As a result of this course, the vice president of CyberConnect2 and the global section chief of human resources for the company will be visiting RIT and The Strong to recruit our upcoming graduates to work in Japan and to explore the exhibits and research assets at The Strong.

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  • Enhanced driving safety with AI camera for person detection | ifm electronic

    Enhanced driving safety with AI camera for person detection | ifm electronic

    This also involves performing a plausibility check on the AI-assisted person detection and comparing it with the environmental information from the 3D sensor. The result is excellent detection performance, unrivalled in rear and area monitoring. The risk of misinterpretation is reduced, while safety is increased because people, obstacles and distances can be detected at the same time and with greater accuracy than ever before.

    On construction sites with blind spots, a construction machine equipped with the O3M AI 2D/3D intelligent sensor system can reverse more quickly. A municipal vehicle can stop reliably, even if the person crossing is difficult to detect. At airports or container terminals, the sensor system guides the positioning of a passenger boarding bridge or a container to within centimetres without risk of collision. The combination of the two technologies virtually eliminates the annoying false triggers that are almost inevitable with conventional 3D systems. The number of false alarms is significantly reduced. This is because the system can detect whether there is a person or a pile of earth in the vehicle’s path. The result is increased efficiency in the work process.

    Such is achieved through the unique combination of a 3D PMD sensor and 2D AI camera in an embedded area monitoring system. System reliability is greatly enhanced by fusing data from two different types of sensors on a fully integrated and calibrated platform. AI analysis of the 2D camera data improves the quality of object detection, enabling it to distinguish between people and other obstacles. The new collision warning system works much better and more accurately than conventional solutions. The O3M AI smart sensor system uses the data from the 2D and 3D cameras to generate a video that displays the surroundings and simultaneously overlays information on the exact distances to all objects and people within a radius of up to 25 metres onto the image. The O3M AI can always tell whether emergency braking, a controlled stop or deceleration would be appropriate in a given situation.

    The high-resolution digital Ethernet camera is equipped with a powerful processor with AI accelerator (NPU). This enables ultra-fast processing of the AI algorithms for person detection directly in the system. In addition to the Ethernet camera, a 3D PMD camera is integrated. It provides an accurate distance measurement to the object in every single pixel based on the PMD time-of-flight principle. Depth mapping from the 3D system and video from the Ethernet camera can be combined or used on their own, depending on the application.

    The O3M AI’s person and obstacle detection has been optimised for mobile machines. The collision warning system can accurately distinguish between a distant obstacle and a person in close proximity, even if that person is lying on the ground, is wearing dark clothing or is difficult for conventional systems to detect due to larger tools or unusual posture. It works in both bright sunlight and twilight and has a maximum range of 25 metres with an accuracy of 10 centimetres.

    The AI, hardware and software have been developed in Germany by ifm. A wide variety of people, equipment and work positions from the typical mobile machine work environment are included in the AI training examples. The result is a far greater gradation of possible alarms and warnings from the system. When it comes to striking the right balance between efficiency and safety, this is an important criterion.

    The new combined sensor system for mobile machines is available in several versions. With integrated AI and person detection, it is available from ifm under the article designation O3M372. It is part of an extensive ecosystem for mobile machines that ifm has built up over 35 years.

    About the ifm group of companies
    Measuring, controlling and evaluating – when it comes to pioneering automation and digitalisation technology, the ifm group is the ideal partner. Since its foundation in 1969, ifm has developed, produced and sold sensors, controllers, software and systems for industrial automation and for SAP-based solutions for supply chain management and shop floor integration worldwide. As one of the pioneers of Industry 4.0, ifm develops and implements consistent solutions to digitalise the entire value chain “from sensor to ERP”. Today, the second-generation family-run ifm group has more than 8,750 employees and is one of the worldwide market leaders. The group combines the internationality and innovative strength of a growing group of companies with the flexibility and close customer contact of a medium-sized company.

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  • Johnson Controls announces third quarter 2025 earnings conference call webcast

    Johnson Controls announces third quarter 2025 earnings conference call webcast

    CORK, Ireland, July 8, 2025 /PRNewswire/ -- Johnson Controls International plc (NYSE: JCI), the global leader for smart, healthy and sustainable buildings, announces the following webcast: 

    What: Johnson Controls Third Quarter Fiscal 2025 Earnings Conference Call

    When: Tuesday, July 29, 2025, at 8:30 a.m. ET

    How: The conference call for investors can be accessed in the following ways:

    • Live via webcast at http://investors.johnsoncontrols.com/news-and-events/events-and-presentations Note: A slide presentation will be available that morning for downloading.
    • Live via telephone (for "listen-only" participants and those who would like to ask a question) by dialing 855-979-6654 (in the United States) or +1-646-233-4753 (outside the United States) along with passcode 330296.

    Replay: The replay can be accessed in the following ways:

    • Replay via webcast – if you are unable to participate during the live webcast, the call will be archived at http://investors.johnsoncontrols.com/news-and-events/events-and-presentations.
    • Replay via telephone – by dialing 855-762-8306 (in the United States) or +1-845-709-8569 (outside the United States), passcode 949453, from 10:30 a.m. (ET) on July 29, 2025, until 11:59 p.m. (ET) on Aug. 12, 2025.

    About Johnson Controls 
    At Johnson Controls (NYSE:JCI), we transform the environments where people live, work, learn and play. As the global leader in smart, healthy and sustainable buildings, our mission is to reimagine the performance of buildings to serve people, places and the planet. 

    Building on a proud history of 140 years of innovation, we deliver the blueprint of the future for industries such as healthcare, schools, data centers, airports, stadiums, manufacturing and beyond through OpenBlue, our comprehensive digital offering. 

    Today, Johnson Controls offers the world`s largest portfolio of building technology and software as well as service solutions from some of the most trusted names in the industry. 

    Visit www.johnsoncontrols.com for more information and follow @Johnson Controls on social platforms. 

    INVESTOR CONTACT:

    MEDIA CONTACT:

    Jim Lucas                                     

    Danielle Canzanella

    Direct: 414.340.1752

    Direct: 414.524.8687

    Email: jim.lucas@jci.com 

    Email: Danielle.canzanella@jci.com

    SOURCE Johnson Controls International plc


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  • Efficacy of Topical Phenytoin in the Management of Diabetic Foot Ulcers: A Systematic Review

    Efficacy of Topical Phenytoin in the Management of Diabetic Foot Ulcers: A Systematic Review


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  • Optics / Photonics Information | AZoOptics.com

    Optics / Photonics Information | AZoOptics.com

    While we only use edited and approved content for Azthena
    answers, it may on occasions provide incorrect responses.
    Please confirm any data provided with the related suppliers or
    authors. We do not provide medical advice, if you search for
    medical information you must always consult a medical
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    Your questions, but not your email details will be shared with
    OpenAI and retained for 30 days in accordance with their
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    Please do not ask questions that use sensitive or confidential
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    Read the full Terms & Conditions.

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  • Jannik Sinner vs Ben Shelton, Wimbledon 2025 quarter-final, Wednesday 9 July: head-to-head, schedule and how to watch live

    Jannik Sinner vs Ben Shelton, Wimbledon 2025 quarter-final, Wednesday 9 July: head-to-head, schedule and how to watch live

    Wimbledon 2025 – where to watch Jannik Sinner vs Ben Shelton live

    Sinner and Shelton will meet in the quarter-finals on Wednesday, 9 July, on No. 1 Court. They will follow the women’s singles match between Iga Swiatek and Liudmila Samsonova, which begins at 13:00 local time (BST, GMT+1).

    ESPN will show the match across South America and in the USA, where Tennis Channel also hold rights. Fans in Italy can follow the action on Sky Sports.

    Wimbledon is broadcast for free in Great Britain on the BBC, who cover the two weeks across their broadcast and digital channels. Canadian fans can follow the action live on TSN and RDS, while Nine Network Australia and Stan Sport share the broadcast of matches in Australia.

    In India, Wimbledon will be shown on Star Sports and JioHotstar, with SPOTV the place to watch the tennis in the Philippines.

    Find the full list of broadcasters for the Championships here.

    Sinner and Shelton will meet in the quarter-finals on Wednesday, 9 July, with the court and start time still to be confirmed.

    ESPN will show the match across South America and in the USA, where Tennis Channel also hold rights. Fans in Italy can follow the action on Sky Sports.

    Wimbledon is broadcast for free in Great Britain on the BBC, who cover the two weeks across their broadcast and digital channels. Canadian fans can follow the action live on TSN and RDS, while Nine Network Australia and Stan Sport share the broadcast of matches in Australia.

    In India, Wimbledon will be shown on Star Sports and JioHotstar, with SPOTV the place to watch the tennis in the Philippines.

    Find the full list of broadcasters for the Championships here.

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  • More Bubbles Means More Variation in Ocean Carbon Storage

    More Bubbles Means More Variation in Ocean Carbon Storage

    Source: Global Biogeochemical Cycles

    The ocean absorbs carbon from the atmosphere, but exactly how much is uncertain. For instance, estimates from the 2023 Global Carbon Budget ranged from 2.2 billion to 4 billion metric tons of carbon per year. One source of this uncertainty may be that the effects of bubbles have not been incorporated into air-sea carbon flux estimates, according to Rustogi et al.

    When waves break, they create multitudes of tiny bubbles that carry gases such as carbon dioxide back and forth between the atmosphere and water. Models used to evaluate how fast this exchange occurs typically rely on measurements of wind speed, assuming that wind speed directly relates to the prevalence of bubble-forming waves. However, waves can be affected by other factors as well, meaning this assumption doesn’t always hold.

    To assess the role of bubbles in air-sea carbon exchange in more detail, scientists applied a recently developed “bubble-mediated gas transfer theory” to the ocean. As with other models, the bubble-mediated approach incorporates wind strength, but uniquely, it also accounts for wave conditions that form gas-carrying bubbles. The researchers compared the results from their new model to a simpler, wind-only model that ignores the effect of bubbles.

    The two models yielded similar estimates for total annual ocean carbon storage, but the bubble-mediated model showed much higher variability, both seasonally and regionally; in some instances, local fluxes it indicated differed by 20%–50% from the wind-only model. The bubble-mediated model also suggested that intense wave activity in the Southern Hemisphere leads to much higher carbon storage than in the relatively calm Northern Hemisphere—a difference that’s not obvious in the wind-only model.

    That north-south difference could have implications for interpreting and projecting carbon cycle dynamics in a changing climate. With average wind speeds and wave heights likely to increase with global warming, it is essential to anticipate accurately how these changes will influence ocean carbon storage, the authors say.

    The work is also important for marine carbon dioxide removal projects aiming to enhance carbon uptake to mitigate climate change effects, they note. A prerequisite for these efforts is quantifying how much carbon the ocean takes up naturally. Without a comprehensive understanding of the processes affecting uptake, the impacts of such interventions may be vastly under- or overestimated. (Global Biogeochemical Cycles, https://doi.org/10.1029/2024GB008382, 2025)

    —Saima May Sidik (@saimamay.bsky.social), Science Writer

    Citation: Sidik, S. M. (2025), More bubbles means more variation in ocean carbon storage, Eos, 106, https://doi.org/10.1029/2025EO250244. Published on 8 July 2025.
    Text © 2025. AGU. CC BY-NC-ND 3.0
    Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

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  • Hovering fish burn twice the energy—study shocks scientists

    Hovering fish burn twice the energy—study shocks scientists

    Fish make hanging motionless in the water column look effortless, and scientists had long assumed that this meant it was a type of rest. Now, a new study reveals that fish use nearly twice as much energy when hovering in place compared to resting.

    The study, led by scientists at the University of California San Diego’s Scripps Institution of Oceanography, also details the biomechanics of fish hovering, which includes constant, subtle fin movements to prevent tipping, drifting or rolling. This more robust understanding of how fish actively maintain their position could inform the design of underwater robots or drones facing similar challenges.

    The findings, published on July 7 in the Proceedings of the National Academy of Sciences, overturn the long-standing assumption in the scientific literature that maintaining a stationary position in water is virtually effortless for fish with swim bladders.

    The reason for this assumption was that nearly all bony fishes have gas-filled sacs called swim bladders that allow them to achieve neutral buoyancy — neither sinking nor rising to the surface. The presence of a swim bladder and the stillness of hovering fish caused the research community to assume hovering was a form of rest that was easy for fish to maintain.

    Prior research from lead study author and Scripps marine biologist Valentina Di Santo found that the energy required for skates to swim at various speeds followed a distinct U-shaped curve, with slow and fast swimming requiring the most energy and intermediate speeds being the most energy-efficient. Based on these findings, Di Santo suspected there might be more to hovering than meets the eye.

    To learn more, Di Santo and her co-authors conducted experiments with 13 species of fishes with swim bladders.

    The team placed each fish in a specialized tank and recorded their oxygen consumption during active hovering and motionless resting (when the fish supports its weight with the bottom of the tank). While the fish were hovering, the researchers filmed them with high-speed cameras to capture their fin movements, tracking how each fin moved and how frequently they beat.

    The researchers also took a variety of measurements of each fish’s body size and shape. In particular, the scientists measured the physical separation between the fish’s center of mass, which is determined by weight distribution, and its center of buoyancy, which is related to the shape and location of its swim bladder. All these measurements provided a way to quantify how stable or unstable each fish was.

    The study found that, contrary to previous assumptions, hovering burns roughly twice as much energy as resting.

    “Hovering is a bit like trying to balance on a bicycle that’s not moving,” said Di Santo.

    Despite having swim bladders that make them nearly weightless, fish are inherently unstable because their center of mass and center of buoyancy don’t align perfectly. This separation creates a tendency to tip and roll, forcing fish to make continuous adjustments with their fins to maintain position. The study found that species with greater separation between their centers of mass and buoyancy used more energy when hovering. This suggests that counteracting instability is one of the factors driving the energy expended during hovering.

    “What struck me was how superbly all these fishes maintain a stable posture, despite their intrinsic instability,” said Di Santo.

    A fish’s shape and the position of its pectoral fins also influenced its hovering efficiency. Fish with pectoral fins farther back on their body were generally able to burn less energy while hovering, which Di Santo suggested may be due to improved leverage. Long, slender fish, such as the shell dweller cichlid (Lamprologus ocellatus) and the giant danio (Devario aequipinnatus), were less efficient at hovering, and fish with deep, compact bodies, such as the goldfish (Carassius auratus) or the figure-eight pufferfish (Dichotomyctere ocellatus), were more efficient.

    “This changes how we see hovering. It’s not a form of rest at all,” said Di Santo. “It’s an energetically costly activity but one that fish engage in anyway because it can be very useful.”

    Activities like guarding nests, feeding in specific locations or maintaining position in the water column are far more demanding than previously thought. The study’s findings also reveal an evolutionary trade-off in fish body shapes, where increased maneuverability comes at the cost of hovering efficiency and vice versa. Rather than being a drawback, Di Santo said, the high energy cost of hovering is a necessary trade-off that gives fishes the exceptional agility required to navigate the challenges of complex habitats such as coral reefs.

    These findings could inform the design of underwater robots and vehicles, which must also maintain stability while remaining agile.

    “By studying how fish achieve this balance, we can gain powerful design principles for building more efficient, responsive underwater technologies,” said Di Santo.

    In particular, the findings could help improve the maneuverability of underwater robots, which could allow them to access and explore complex, hard-to-navigate environments like coral reefs or shipwrecks. According to Di Santo, underwater robots have historically been designed with compact shapes that make them stable. As in fish, shapes with more built-in stability are less maneuverable.

    “If you want a robot that can maneuver through tight spaces, you might have to learn from these fishes to design in some instability and then add systems that can dynamically maintain stability when needed,” said Di Santo.

    In addition to Di Santo, the study was co-authored by Xuewei Qi of Stockholm University, Fidji Berio of Scripps Oceanography, Angela Albi of Stockholm University, the Max Planck Institute of Animal Behavior, and the University of Konstanz, and Otar Akanyeti of Aberystwyth University in Wales. The research was supported by the Swedish Research Council, the European Commission, the Stockholm University Brain Imaging Centre and the Whitman Scientist Program at the Marine Biological Laboratory.

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