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  • a new way to detect disease at a glance

    a new way to detect disease at a glance

    Design and working principle of the multicolor urea biosensor.

    GA, UNITED STATES, August 1, 2025 /EINPresswire.com/ — A team of researchers has developed a new biosensor that turns the invisible signals into visible color changes to detect urea levels in a simple way. The sensor works by combining gold nanoparticles and a pH-controlled reaction, with a special chemical reaction that changes color depending on the amount of urea. As more urea is present, the reaction slows down, and the gold nanoparticles keep their shape, resulting in a visible color shift. This enables a clear, multicolor visual cue across a wide concentration range. The sensor can detect urea down to 0.098 µM in solution and 0.2 µM in solid form. It significantly outperforms traditional methods and performed well in real urine samples, opening new possibilities for easy, accurate urea monitoring at the point of care.

    Urea is a vital indicator of human health, particularly for diagnosing kidney and liver function. It is also widely used in agriculture, where overuse can lead to environmental contamination. While colorimetric tests are popular for their simplicity, most existing tools rely on single-color changes that are difficult to interpret by the naked eye, especially at low concentrations. More advanced methods, like fluorometry or electrochemical sensing, require complex equipment or training, limiting their accessibility. Improving the clarity and sensitivity of urea detection, especially through a visual and low-tech method—could bridge this gap. Due to these challenges, there is a growing need to develop multicolor sensors capable of intuitive, high-resolution readouts for both clinical and environmental use.

    Scientists at Sungkyunkwan University, South Korea, have unveiled a multicolor biosensing platform for urea detection, published (DOI: 10.1038/s41378-025-00931-5) on June 5, 2025, in Microsystems & Nanoengineering. The new sensor uses an enzyme called urease to break down urea to produce ammonia and raise the pH. This rise in pH prevents the chemical reaction that would normally change the gold nanoparticles. As a result, the particles keep their shape. Unlike conventional tests, this biosensor offers five visually distinct colors: blue, violet, purple, pink, and red, depending on the urea level. that can be read by the naked eye. The team validated the sensor’s performance in both liquid and solid formats, paving the way for convenient, ultra-sensitive urea testing in clinical and field settings.

    To make the sensor more practical and easier to handle, the team also developed a solid version using a gel by embedding the sensing chemistry into a hydrogel. This makes it easier to store and use. Both the liquid and solid versions worked well and were not affected by other substances in urine. The sensor’s performance rivaled that of commercial urea kits, while offering the unique advantage of real-time, multicolor visual feedback. A built-in self-validation feature further ensures reliability by showing a clear color change only when all components function properly, making the sensor both powerful and foolproof.

    “This sensor is not only technically advanced but also user-centric,” said Professor Dong-Hwan Kim, senior author of the study. “Its multicolor output allows anyone—even without lab training—to interpret results clearly and quickly. By controlling the Fenton etching through a simple pH shift, we’ve unlocked a highly tunable visual signal that outperforms many current diagnostic tools. We believe this is a significant step forward for point-of-care diagnostics, especially in resource-limited settings.”

    This visually intuitive biosensor holds enormous potential for healthcare and environmental monitoring. Its solid-state format simplifies storage and usage, making it ideal for portable diagnostic kits, home testing, and rural clinics. In medical settings, the sensor can offer early warnings of kidney dysfunction or metabolic imbalance through simple urine analysis. In agriculture, it could be adapted for on-site detection of urea-based fertilizer runoff. Moreover, the underlying principle—pH-modulated nanoparticle etching—could be expanded to detect other analytes using similar strategies. With its combination of accuracy, ease of use, and multicolor feedback, this biosensor represents a meaningful leap toward accessible, next-generation diagnostics.

    DOI
    10.1038/s41378-025-00931-5

    Original Source URL
    https://doi.org/10.1038/s41378-025-00931-5

    Funding information
    This work was supported by the Institute for Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (RS-2023-00228994), RS-2024-00346003, and the National Research Foundation of Korea (2020R1A5A1018052) and (RS-2024-00410209).

    Lucy Wang
    BioDesign Research
    email us here

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  • AI is not Africa’s savior: Avoiding technosolutionism in digital development

    AI is not Africa’s savior: Avoiding technosolutionism in digital development

    In early April, the Rwandan government hosted the inaugural Global AI Summit on Africa, which served as a forum to facilitate critical discussions on the impact of artificial intelligence (AI) in Africa and present tangible progress made within the AI startup, digital infrastructure, economic, and governance landscape. With almost 2,000 delegates in attendance, a significant number of whom were from Africa, the event provided a venue for global stakeholders to understand the nuances and experiences of advancing AI in Africa. Over two days, the summit presented a diverse array of sessions, side events, and cultural celebrations. For many observers of AI governance and policy, this marked the first major international forum where African perspectives were comprehensively represented, resulting in the first Africa Declaration on Artificial Intelligence (“Declaration”). 

    The Africa Declaration on Artificial Intelligence 

    The Declaration presents a roadmap for advancing AI development in Africa, while setting goals for African countries and stakeholders across the continent to ensure AI development aligns with African values, priorities, and cultural contexts. Signed by 49 out of 55 African Union member states, the African Union secretariat, and Smart Africa, the Declaration represents the first cohesive AI-focused agreement within the continent, and this development occurs within a broader context of international AI governance initiatives. Numerous other AI declarations have emerged over the past few years, including the Bletchley Declaration, the Hamburg Declaration on Responsible AI, and the Global Partnership on Artificial Intelligence’s New Delhi Declaration. However, these previous efforts have demonstrated limited transparency regarding implementation strategies and outcomes of accompanying funding commitments. The Africa Declaration’s success will ultimately depend on whether signatory nations can effectively align with the outlined objectives and follow through on their commitments. 

    Geopolitical challenges and regional fragmentation 

    Despite the summit’s achievements, several structural challenges threaten the harmonization of Africa’s AI ambitions. The event itself appeared to be affected by geopolitical tensions, most notably Rwanda’s ongoing conflict with the Democratic Republic of Congo. From my observation, this situation led to a notable absence of representatives from prominent funders within the African AI ecosystem, particularly international development agencies from European and North American countries. The limited presence of African Union employees, aside from the chairperson of the African Union Commission and the Commissioner of Infrastructure and Energy, further highlighted these perceived tensions. Additional conflicts, such as violent extremism in the Western Sahel, the departure of authoritarian-ruled countries from the ECOWAS regional bloc, and the humanitarian crisis in Sudan, continue to impact regional harmony. These divisions raise concerns that efforts to position the continent as a “major AI player” may inadvertently lead to further stratification. Such fragmentation could advance the goals of larger countries with more economic resources to devote to AI, while marginalizing smaller countries with fewer resources, a pattern that mirrors existing economic inequalities within the continent. 

    Avoiding the trenches of AI hype in Africa  

    My engagement in the summit revealed concerning patterns of AI hype that reflect broader issues in Africa’s technology and development discourse. The fundamental premise that AI represents a panacea for Africa’s myriad challenges across effective governance, corruption, socioeconomic development, infrastructure, and conflict demonstrates a form of technological determinism that warrants critical examination. This ethos is encapsulated in the term “technosolutionism,” which is the belief that societal problems can be solved through technological solutions, often with a focus on digital technologies and automation. 

    Evidence of this “technosolutionist” approach emerged in a report distributed at a session sponsored by Google, Sand Technologies, and the African Leadership University. This document claimed that “AI is the Only Way to Transform Critical Sectors in Sub-Saharan Africa.” This assertion exemplifies the ideology of technosolutionism, which has become increasingly prominent in efforts to “democratize” AI development and implement solutions targeted toward the United Nations’ Sustainable Development Goals, a set of 17 interconnected goals adopted by all United Nations (UN) member states in 2015. Such claims require particular scrutiny, given that large and emerging tech companies have significant incentives to promote these narratives. These organizations seek to sell applications to consumers, businesses, and governments, with African governments likely representing the largest potential market for AI solutions across the continent. This commercial interest creates inherent conflicts when evaluating the objective merits of AI interventions. 

    The past few years have given rise to numerous problematic claims that demonstrate the gap between AI hype and current technical capabilities, and Africa has not been exempt from this. During the summit, a comment was made that artificial general intelligence (AGI) would arrive by the end of 2025, a timeline unsupported by current AI progress and expert consensus. The concept of AGI itself raises important questions about cultural and linguistic inclusivity. AGI refers to a hypothetical form of AI that possesses the ability to understand, learn, and apply knowledge across a wide range of tasks and domains, similar to or even surpassing human cognitive abilities. If an AI system cannot function effectively across diverse languages, contexts, and domains, its claim to “general intelligence” becomes questionable. Current definitions of AGI often implicitly assume Western, English-speaking contexts, excluding the experiences and needs of millions of communities who make up a significant portion of the world’s population. Similarly, a comment made stating intentions to build large language models (LLMs) for every African language, demonstrate both technical infeasibility and conceptual misunderstanding given linguistic data gaps and infrastructural deficiencies that inhibit model performance for African languages. However, these attempts to adopt mainstream paradigms of AI development may overlook the greater utility of small language models, which show promise for consumers using mobile devices in resource-constrained settings.  

    The reality is that AI systems are quite far from being generally intelligent, LLMs are not the solution to every natural language processing challenge, and this interest in accelerating toward AGI is a significant factor driving AI hype, along with negative climate and social impacts. 

    Balancing perspectives on AI’s potential 

    Due to the need for substantial progress in addressing fundamental development issues on the African continent, AI adoption efforts may generate positive spillover effects, even if (and when) the current AI bubble contracts. Because meaningful participation in AI research and development necessitates sizable investment in electrical infrastructure, telecommunications, cloud computing, and education, investments in these areas could enable African countries to deliver stable electricity, higher internet penetration, better access to digital services, and stronger educational systems to their citizens. Such improvements could potentially result in more robust health care systems, higher agricultural yields, reduced poverty, greater employment opportunities, and improved governance structures. In lieu of this vision becoming reality, AI hype should not distract governments from making fundamental progress toward development needs independent of their AI interests. 

    Recommendations for responsible AI development in Africa and beyond 

    The pursuit of AI innovation in Africa should prioritize technical approaches that align with local constraints and opportunities. Edge computing, federated learning, and model quantization represent promising directions that can address infrastructure limitations while maintaining effectiveness. These approaches acknowledge the realities of resource-constrained environments while avoiding the computational intensity and connectivity requirements of large-scale AI systems. 

    Effective AI development in Africa requires grounding in current realities rather than aspirational technological visions. This approach demands that AI systems be accessible to consumers and reflect the demands of the continent’s growing population. Development priorities should focus on addressing immediate needs while building capacity for future innovation. 

    AI research must also be driven by African stakeholders and rooted in the contexts of the continent. This principle requires meaningful participation from local researchers, developers, policymakers, and civil society organizations. While maintaining ambitious goals remains appropriate, these objectives must be realistic and achievable within existing constraints. 

    Researchers, developers, funders, policymakers, and civil society advocates must play a significant role in countering AI hype. This responsibility includes promoting evidence-based approaches, challenging unrealistic claims, and ensuring AI development priorities align with genuine needs rather than commercial interests. 

    Ending reflections 

    The inaugural Global AI Summit on Africa represents a significant milestone in the global AI ecosystem, particularly in centering African perspectives and priorities. However, the event also highlighted persistent challenges including geopolitical tensions and the influence of technosolutionist thinking—critical aspects that must be considered as the organizers prepare for a second convening. The true measure of progress in AI development lies not in the sophistication of algorithms but in whether these tools genuinely serve the people and communities they seek to empower. Without grounding in human dignity and local contexts, AI acceleration risks creating technological microcosms of subjugation rather than serving as catalysts for indigenous self-determination. 

    As Africa continues to engage with AI development, success will depend on maintaining realistic expectations, addressing fundamental infrastructure and development needs, and ensuring that technological progress serves broader goals of social and economic empowerment. The continent’s AI future should be shaped by African voices, priorities, and values, not by external hype or commercial interests that may not align with local needs and aspirations. 

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  • Sophie, Duchess of Edinburgh swaps Emilia Wickstead midi dress for army fatigues & overalls at poignant visit

    Sophie, Duchess of Edinburgh swaps Emilia Wickstead midi dress for army fatigues & overalls at poignant visit

    The Duchess of Edinburgh made a very special visit to mark a milestone military anniversary and swapped her midi dress for army fatigues and even overalls during the event.

    Arriving in Tidworth, in Wiltshire, Sophie, Duchess of Edinburgh paid a special visit to two Battalions at their headquarters, marking their 25th anniversary, as she is their Colonel-in-Chief (The Corps of Royal Electrical and Mechanical Engineers).

    During a parade, Sophie inspected one of the battalions while wearing a blue and white Emilia Wickstead midi shirt dress (see post below – although currently out of stock). The designer is a go-to choice for the royals, who frequently turn to her designs for public events. However, The Duchess underwent a number of outfit changes on the day, leaving her elegant dress and heels behind for something a little more practical.

    To head out on to the Salisbury Plain Training Area, Sophie changed into a khaki military camouflage jacket and trousers as she met with soldiers. She learned about ‘the work they do to maintain and repair the Army’s armoured vehicles and equipment’, explained the Royal Family in an official post.

    The Duchess was also able to tour the workshop where repairs take place and even donned overalls and a safety mask to have a go with the power tools herself (photos in post above).

    It’s been a busy summer of events for The Duchess, who has attended Royal Ascot and Wimbledon, as well as official appearances such as the Order of the Garter, which took place last month.

    Elsewhere this week, Princess Anne was also on a military visit but this time in Scotland with the Royal Edinburgh Military Tattoo. They were rehearsing for a special show, The Heroes Who Made Us, and thanked The Princess Royal for joining them at rehearsals.

    ‘Thank you to Her Royal Highness The Princess Royal for spending time with us and our cast today! It was a real privilege to have you join our rehearsals and see what we’ve been working on,’ wrote the Royal Edinburgh Military Tattoo in a joint post with the Royal Family on Instagram.

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  • Industry reacts to AI Mode| Amazon exits Google Shopping | Coldplay meme a trap for brands: this week’s must reads

    Industry reacts to AI Mode| Amazon exits Google Shopping | Coldplay meme a trap for brands: this week’s must reads

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  • These States Could See Aurora Borealis Friday

    These States Could See Aurora Borealis Friday

    Topline

    Northern residents of seven continental states may be able to view the northern lights Friday night despite no significant predictions for geomagnetic storms, according to the latest National Oceanic and Atmospheric Administration forecast.

    Key Facts

    NOAA forecast a Kp index of two on a scale of nine for Friday, suggesting the northern lights might be more visible farther from the poles and into the northern United States.

    Friday will give Americans the best chance to see the lights of the next three days, with the likelihood of geomagnetic activity and storms dropping daily through Sunday.

    Get Forbes Breaking News Text Alerts: We’re launching text message alerts so you’ll always know the biggest stories shaping the day’s headlines. Text “Alerts” to (201) 335-0739 or sign up here: joinsubtext.com/forbes.

    Where Will The Northern Lights Be Visible?

    The northern lights will have the best chance of being seen throughout Canada and Alaska but NOAA’s predicted “view line” dips into Washington, Idaho, Montana, North Dakota, Minnesota, Wisconsin, and upper Michigan. (See map below.)

    What’s The Best Way To See The Northern Lights?

    Usually from a high vantage point, away from light pollution, while facing north sometime between 10 p.m. and 2 a.m. local time, according to NOAA. The lights will be most visible this weekend at around 3 a.m. Saturday, according to NOAA’s kp index forecast.

    What’s The Best Way To Photograph The Northern Lights?

    Flash on smartphones should be turned off and night mode enabled, NOAA suggests, and using a tripod can help to stabilize the image. With a separate camera, photography experts told National Geographic it’s best to use a wide-angle lens, an aperture or F-stop of four or less and a focus set to the furthest possible setting.

    Key Background

    Also known as the Aurora Borealis, the Northern Lights appear as a colorful phenomena in the night sky when electrically charged particles from the sun collide with the Earth’s atmosphere. The Northern Lights are most visible near the Arctic Circle because Earth’s magnetic field redirects the particles toward the poles, but they can stretch far beyond their usual range during times of high solar activity. The lights’ bright colors are determined by the chemical composition of the atmosphere.

    Further Reading

    ForbesNorthern Lights Displays Hit A 500-Year Peak In 2024—Here’s Where You Could Catch Aurora Borealis In 2025

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  • Less Than $10M Away From Beating The Meg’s Global Haul & Achieve A Remarkable Feat!

    Less Than $10M Away From Beating The Meg’s Global Haul & Achieve A Remarkable Feat!

    Superman Worldwide Box Office: Less Than $10M Away From Beating The Meg ( Photo Credit – Instagram )

    James Gunn’s Superman is moving closer to completing one month at the theaters. It has achieved several box office milestones and amassed over $500 million worldwide. The film is now on track to achieve yet another interesting feat soon. This will happen after it surpasses the global haul of The Meg and among Warner Bros Pictures-produced films. Keep scrolling for the deets.

    The DCU movie is the first film in the studio’s Chapter One: Gods and Monsters. Like Marvel, which breaks the timeline into Phases, James Gunn and Peter Safran seem to be differentiating movies as part of several chapters. The critics enjoyed the fun and vibrant vibe of the movie while praising David Corenswet, Rachel Brosnahan, and Nicholas Hoult’s performances.

    How much has the DCU movie earned at the worldwide box office?

    Superman’s domestic box office collection after 20 days is $299.7 million, including $2.9 million from this Wednesday. The DCU movie’s latest overseas cume has reached $223.0 million, and allied to the domestic gross, the worldwide collection has hit $522.7 million. It will soon outpace Brad Pitt starrer F1’s $523.4 million as the sixth highest-grossing Hollywood movie of the year.

    Worldwide Collection Breakdown

    • North America – $299.7 million
    • International – $223.0 million
    • Worldwide – $522.7 million

    Set to beat The Meg & be one of Warner Bros Pictures’ top 40 grossers

    According to The Numbers, Superman is the #43 highest-grossing film ever produced by Warner Bros Pictures. To enter the top 40 list, it will have to surpass The Meg. For the unversed, The Meg is a 2018 sci-fi flick by Jon Turteltaub featuring Jason Statham in the leading role. The Meg collected $529.3 million worldwide and is the #40 highest-grossing film through WB. The DCU movie is less than $10 million away from beating that number and cracking the all-time top 40 grossers list of Warner Bros Pictures.

    More about the film

    Superman, directed by James Gunn, follows Clark Kent as he navigates his dual identity, balancing his Kryptonian heritage with his human upbringing. While facing global threats and personal dilemmas, he strives to bring hope to a world increasingly uncertain about heroes. The story reintroduces classic characters with a grounded, emotional core, offering a fresh start for the iconic superhero in James Gunn’s DC Universe. Superman was released on July 11.

    Stay tuned to Koimoi for more box office updates!

    Must Read: Jurassic World Rebirth Worldwide Box Office: Scarlett Johansson’s Film Lags Over $274M Behind Dominion, Comeback Looks Unlikely

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  • Pharmacists Help Emphasize Importance of Immunizations for Patients

    Pharmacists Help Emphasize Importance of Immunizations for Patients

    Vaccination has been a hot-button topic recently, not just in pharmacy, but health care in general. August is National Immunization Awareness Month, and this year, the importance of vaccination is greater than ever. National Immunization Awareness Month aims to increase awareness about the importance of vaccination for community members.1

    This month is National Immunization Awareness Month, highlighting the importance of pharmacists in educating patients on vaccination. | Image Credit: Dusan Petkovic – stock.adobe.com

    Earlier in 2025, Secretary of Health and Human Services Robert F. Kennedy Jr. removed all 17 members of the CDC’s Advisory Committee for Immunization Practices, replacing them with his own appointees. He wrote in the Wall Street Journal, “Without removing the current members, the current Trump administration would not have been able to appoint a majority of new members until 2028.”2

    Kevin Cleveland, PharmD, professor at Idaho State University, said the impact of this decision will affect health care providers’ trust in federal health entities.3

    “We’re going to have to resort to our tried [and] tested process of literature evaluation,” Cleveland said.3 “We should always be doing that anyways, but I think we’re going to have to be more diligent about that. I think the other thing is that we’re going to have to rely a little bit more on our associations, such as [the] American Pharmacists Association [and the] American Medical Association, to help us navigate some of that.”

    Pharmacists play an important role in helping patients navigate vaccination needs, according to Cherokee Layson-Wolf, PharmD, BCACP, FAPhA, professor of practice, sciences, and health outcomes research at the University of Maryland. Trust between patients and pharmacists has been well established, so Layson-Wolf said it is important to let patients know they can still ask their health care providers questions.4

    “The very first thing we need to do as pharmacists is to understand the concern that our patients have and to share information with them if they’re willing,” Layson-Wolf said.4 “We really have to work together as health care providers and we can hopefully answer our patients’ questions well.”

    Communication between pharmacists and patients can help educate on the importance of vaccination, especially as policies continue to change rapidly and questionable information floods social media.

    “I’m encouraging patients to talk to trusted health care professionals and to not get their advice from social media or the internet or other strangers, focusing on the fact that vaccines have been studied before, during, and after FDA approval,” Laura Knockel, PharmD, BCACP, clinical associate professor at Iowa College of Pharmacy, said.5 “They’re more rigorously tested than any other medications because we give them to healthy people, so we have a very, very low tolerance for risk for adverse events.”

    As respiratory season approaches, pharmacists are in a prime position to help educate patients on immunization for respiratory illnesses, including influenza, COVID-19, and respiratory syncytial virus.

    “Pharmacists and pharmacies play a very important role in keeping their communities healthy with services such as immunizations,” Layson-Wolf said.4 “It’s also important for the general public to understand what these changes may mean for them and that there is a long-term impact on our health in the US as a result of these recent events.”

    READ MORE: National Immunization Awareness Month

    Ready to impress your pharmacy colleagues with the latest drug information, industry trends, and patient care tips? Sign up today for our free Drug Topics newsletter.

    REFERENCES
    1. CDC. National Immunization Awareness Month (NIAM). August 29, 2024. Accessed July 23, 2025. http://cdc.gov/vaccines/php/national-immunization-awareness-month/index.html
    2. Kennedy RF. RFK Jr.: HHS Moves to Restore Public Trust in Vaccines. Wall Street Journal. June 9, 2025. Accessed June 10, 2025. https://www.wsj.com/opinion/rfk-jr-hhs-moves-to-restore-public-trust-in-vaccines-45495112?gaa_at=eafs&gaa_n=ASWzDAiH1Pjiae024CiH_b_Wh31Ro3q2rhhVJfDwdFKXljN3K9lun7VnDTCQHYji1G8%3D&gaa_ts=684834fa&gaa_sig=pNrACbNGdjz6UBQfj3rqoVVNnA-6301ct7N_g4BNTwpKBlJt0skSmPYW2EcbLZW7SMpblNGeCJOMXIL-PGmUlQ%3D%3D
    3. Gallagher A, Cleveland K. Q&A: How ACIP Changes Could Reshape Patient Care. Drug Topics. July 5, 2025. Accessed July 23, 2025. https://www.drugtopics.com/view/q-a-how-acip-changes-could-reshape-patient-care
    4. Gallagher A, Layson-Wolf C. Q&A: Pharmacist Highlights Challenges in Vaccine Information Navigation Amid Changing Recommendations. Drug Topics. July 2, 2025. Accessed July 23, 2025. https://www.drugtopics.com/view/q-a-pharmacist-highlights-challenges-in-vaccine-information-navigation-amid-changing-recommendations
    5. Gallagher A, Knockel L. Q&A: Expert Highlights Importance of Trusted Sources for Vaccine Information. Drug Topics. July 6, 2025. Accessed July 23, 2025. https://www.drugtopics.com/view/q-a-expert-highlights-importance-of-trusted-sources-for-vaccine-information

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  • Scientists finally solve the mystery of what triggers lightning

    Scientists finally solve the mystery of what triggers lightning

    Though scientists have long understood how lightning strikes, the precise atmospheric events that trigger it within thunderclouds remained a perplexing mystery. The mystery may be solved, thanks to a team of researchers led by Victor Pasko, professor of electrical engineering in the Penn State School of Electrical Engineering and Computer Science, that has revealed the powerful chain reaction that triggers lightning.

    In the study published on July 28 in the Journal of Geophysical Research, the authors described how they determined strong electric fields in thunderclouds accelerate electrons that crash into molecules like nitrogen and oxygen, producing X-rays and initiating a deluge of additional electrons and high-energy photons — the perfect storm from which lightning bolts are born.

    “Our findings provide the first precise, quantitative explanation for how lightning initiates in nature,” Pasko said. “It connects the dots between X-rays, electric fields and the physics of electron avalanches.”

    The team used mathematical modeling to confirm and explain field observations of photoelectric phenomena in Earth’s atmosphere — when relativistic energy electrons, which are seeded by cosmic rays entering the atmosphere from outer space, multiply in thunderstorm electric fields and emit brief high-energy photon bursts. This phenomenon, known as a terrestrial gamma-ray flash, comprises the invisible, naturally occurring bursts of X-rays and accompanying radio emissions.

    “By simulating conditions with our model that replicated the conditions observed in the field, we offered a complete explanation for the X-rays and radio emissions that are present within thunderclouds,” Pasko said. “We demonstrated how electrons, accelerated by strong electric fields in thunderclouds, produce X-rays as they collide with air molecules like nitrogen and oxygen, and create an avalanche of electrons that produce high-energy photons that initiate lightning.”

    Zaid Pervez, a doctoral student in electrical engineering, used the model to match field observations — collected by other research groups using ground-based sensors, satellites and high-altitude spy planes — to the conditions in the simulated thunderclouds.

    “We explained how photoelectric events occur, what conditions need to be in thunderclouds to initiate the cascade of electrons, and what is causing the wide variety of radio signals that we observe in clouds all prior to a lightning strike,” Pervez said. “To confirm our explanation on lightning initiation, I compared our results to previous modeling, observation studies and my own work on a type of lightning called compact intercloud discharges, which usually occur in small, localized regions in thunderclouds.”

    Published by Pasko and his collaborators in 2023, the model, Photoelectric Feedback Discharge, simulates physical conditions in which a lightning bolt is likely to originate. The equations used to create the model are available in the paper for other researchers to use in their own work.

    In addition to uncovering lightning initiation, the researchers explained why terrestrial gamma-ray flashes are often produced without flashes of light and radio bursts, which are familiar signatures of lightning during stormy weather.

    “In our modeling, the high-energy X-rays produced by relativistic electron avalanches generate new seed electrons driven by the photoelectric effect in air, rapidly amplifying these avalanches,” Pasko said. “In addition to being produced in very compact volumes, this runaway chain reaction can occur with highly variable strength, often leading to detectable levels of X-rays, while accompanied by very weak optical and radio emissions. This explains why these gamma-ray flashes can emerge from source regions that appear optically dim and radio silent.”

    In addition to Pasko and Pervez, the co-authors include Sebastien Celestin, professor of physics at the University of Orléans, France; Anne Bourdon, director of research at École Polytechnique, France; Reza Janalizadeh, ionosphere scientist at NASA Goddard Space Flight Center and former postdoctoral scholar under Pasko at Penn State; Jaroslav Jansky, assistant professor of electrical engineering and communication at Brno University of Technology, Czech Republic; and Pierre Gourbin, postdoctoral scholar of astrophysics and atmospheric physics at the Technical University of Denmark.

    The U.S. National Science Foundation, the Centre National d’Etudes Spatiales (CNES), the Institut Universitaire de France and the Ministry of Defense of the Czech Republic supported this research.

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  • Rectal cancer rate is rising in young people- what are the risk factors – Times of India

    1. Rectal cancer rate is rising in young people- what are the risk factors  Times of India
    2. Alarming Rise in Early-Onset GI Cancers Calls for Early Screening, Lifestyle Change  Medscape
    3. ‘Strategic approach’ key to meeting unique needs of young adults with colorectal cancer  Healio
    4. HEALTH: Diagnosis of cancer in young people  Idaho State Journal
    5. Australia’s bowel cancer rates are world’s highest for under-50s  thelamp.com.au

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  • Free Gear Fridays: Win a 3-Piece Sea to Summit Cook Set

    Free Gear Fridays: Win a 3-Piece Sea to Summit Cook Set

    Support us! GearJunkie may earn a small commission from affiliate links in this article. Learn More

    This week, two lucky winners will each receive a Frontier Collapsible One Pot Cook Set from Sea to Summit. The ultralight, multipiece cook-eat-drink system is the ultimate packable solution for solo meals in the backcountry.

    For a chance to win, submit the form below. Then, check out ways to earn additional entries to increase your chances of landing the prize.

    More on the Prize

    Add preparing meals to the list of ways you’re improving your essentials kit on the trail this season. The Frontier Collapsible One Pot Cook Set is the ultimate cook-eat-drink system for prioritizing weight and space when heading out on solo missions in the backcountry.

    The 1L pot doubles as a bowl and acts as a nesting space for the included collapsible cup and aluminum spork when not in use. The pot has a hard, anodized aluminum base for efficient heat transfer and fast boil times.

    A Click Safe handle ensures a firm grip on hot meals. Food-grade silicone sidewalls allow both the pot and cup to collapse down for easy packing.

    More on the Brand

    Born in 1983, Sea to Summit’s original ethos of “equipping and inspiring” drives the brand’s research and development of new materials, technologies, and production methods across its diverse line of outdoor products. The Sea to Summit team believes epic adventures bring about pure joy, fresh challenges, and fresh thinking.

    Through continued product innovations and design, Sea to Summit strives to make outdoor adventures more successful — from high-altitude expeditions to car camping and everything in between.


    This post was sponsored by Sea to Summit.


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