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A recent study has found that sperm deteriorates over time as it remains in the body, leading researchers to suggest that men who ejaculate more frequently may have better sperm quality.The study, which combined 115 human studies involving nearly 55,000 men and 56 studies on non-human species, found that the longer men went without sex, the more their sperm showed signs of DNA damage and oxidative stress, and the more tests rated the sperm as less viable and poorer swimmers.The World Health Organization (WHO) recommends men abstain from ejaculating for two to seven days before giving sperm for fertility tests or IVF, but the guidelines were designed to obtain the highest sperm count rather than prioritizing the best quality sperm.Dr. Krish Sanghvi, lead author of the study, said: "In men, the negative effects we found on sperm DNA damage and oxidative damage were large-ish, so we are confident that this is a biologically meaningful and important effect."The study's findings suggest that clinicians and couples should reconsider whether long abstinence is always good, as abstinence leads to deterioration in sperm quality.For couples trying to conceive naturally, a balance between quantity and quality needs to be struck, with abstaining for too long or too little potentially affecting sperm quality and quantity.Experts say that for assisted reproductive technology (ART) treatments, it's having the freshest, most healthy sperm that is probably more important, and that the two to seven days abstinence rule may not be as crucial when IVF treatment is taking place.

The UK government's recent announcement to make significant cuts to direct aid to Africa and the Middle East has been met with deep disappointment. This move is seen as a moral dereliction of duty, betraying the world's most marginalised, and a false economy that will bring greater instability to the world and make people less safe. The cut in aid to 0.3% of gross national income (GNI) from 2027 breaks Labour's 2024 manifesto pledge to restore development spending at the level of 0.7% of GNI “as soon as fiscal circumstances allow”. The UK is making the steepest proportion of aid cuts among G7 nations. As James Mattis, Donald Trump's defence secretary, once said: “If you don’t fund the state department fully, then I need to buy more ammunition ultimately.” This highlights the shortsightedness of cutting aid, which could lead to more conflict, famine, and persecution. The UK itself benefits materially from these investments. The recent inquiry by the all-party parliamentary group on global health and security on international health worker recruitment highlights the extent to which the NHS and wider economy rely on the skills, expertise, and partnerships rooted in the global south. The UK has saved £14bn in training costs through international recruitment and continues to depend on globally trained health professionals. Investment in global vaccination, disease surveillance, and research helps stop outbreaks before they spread internationally and place pressure on health systems. Preventing disease at source is one of the smartest investments we can make to protect patients in Britain. The situation in Somalia, on the edge of famine, underscores the importance of sustained investment in global development. Two consecutive failed rainy seasons have left 6.5 million people in crisis, more than double the number a year ago. The UK's humanitarian relief in Somalia is welcome, but the scrapping of nature funding and cuts to climate aid risk compromising its own strategy of preventing crisis before it takes hold.

Mircea Lucescu, Romania's 80-year-old football manager, is defying his physical limitations to pursue his country's World Cup aspirations. Lucescu has been hospitalized three times since December but remains resolute in his mission to lead Romania to their first World Cup in 28 years. Lucescu's determination is rooted in his passion for football and his sense of duty to Romanian football. He believes that his team has a chance to qualify for the World Cup and is focused on preparing them for the playoff semi-final against Turkey. Despite his advanced age and health issues, Lucescu's energy and love for the game have not diminished. He has a long and illustrious career in football, having played for Romania at the 1970 World Cup and later managed the national team to several successful campaigns. Lucescu's approach to coaching emphasizes the importance of mental preparation and motivation. He believes that his players must be strongly motivated and able to control their emotions in order to succeed. The buildup to the Turkey game has not been easy for Lucescu, with injuries to key players Ionut Radu and Marius Marin. However, he remains focused on the task at hand and is determined to lead his team to victory. Lucescu's legacy in football is undeniable, with over 30 trophies won throughout his career. His second stint as Romania manager began shortly after the 2024 European Championship, and he is eager to make a lasting impact on the team. As Lucescu prepares for the playoff semi-final, he is also mindful of the broader context of Ukrainian football, having left a legacy in the country after 12 years at Shakhtar Donetsk and three with Dynamo Kyiv. He keeps in touch with his former players and friends in Ukraine, who are facing a difficult situation due to the ongoing conflict. Lucescu's ultimate goal is to help Romania qualify for the World Cup, not for personal glory but for the benefit of Romanian football. He hopes that his players will treat this game as a moment to mark a before and after, defining a generation and achieving an extraordinary feat for Romania.

A landmark jury verdict has found Meta and YouTube liable for deliberately designing addictive products that harmed a young user, KGM. The jury ruled that the tech companies were both negligent and failed to provide adequate warnings about the potential dangers of their products.The plaintiff, KGM, testified that she became addicted to YouTube at age six and Instagram at nine, which she claimed had deleterious effects on her wellbeing. By age 10, she said she had become depressed and was engaging in self-harm as a result. Her social media use allegedly caused her to have strained relationships with her family and in school.The jury awarded KGM $6m in damages, with Meta to pay 70% and YouTube the remainder. This lawsuit, over social media's alleged harm to young people, was the first of its kind to go to trial.KGM's lawyers argued that the companies' features, such as infinite scrolling and video autoplay, were designed to keep people on the apps and made the products addictive. The plaintiffs' arguments mirrored those brought against big tobacco in the 1990s, focusing on the addictive qualities of social media and the companies' public denial despite knowledge of their products' harms.Meta and YouTube have consistently denied wrongdoing and plan to appeal the verdict. A YouTube spokesperson said the video service was a responsibly built streaming platform, not a social media site. Meta said KGM's mental health issues were brought on by a difficult home life and social media use was not to blame.This trial is the first in a consolidated group of cases brought in California against Meta, TikTok, YouTube, and Snap on behalf of more than 1,600 plaintiffs. The next bellwether case is scheduled to go to trial in July.

Tracy Kidder, an award-winning narrative nonfiction writer, has passed away at the age of 80. Kidder was known for his ability to transform unlikely subjects into bestsellers, captivating readers with his in-depth research and storytelling skills. Throughout his career, Kidder immersed himself in various worlds, producing richly researched books on topics that may not have seemed like light reading. His work included The Soul of a New Machine, which explored the inner workings of a fledgling computer company in Silicon Valley and earned him the Pulitzer Prize and National Book Award in 1981. Kidder's other notable works include Among Schoolchildren, which highlighted the dedication of an inner-city teacher in Holyoke, Massachusetts, and Old Friends, which chronicled the lives of two friends in a nursing home. His book Mountains Beyond Mountains, about a doctor's efforts to bring healthcare to Haiti, introduced his work to a new generation of readers and inspired numerous universities to add it to their reading lists. Kidder's approach to storytelling was rooted in his belief that small things can have a significant impact. He avoided focusing on his personal interests, such as fishing or baseball, to maintain his objectivity and enthusiasm for his subjects. Kidder saw himself as a storyteller, not a 'literary journalist' or 'creative nonfiction' writer, and believed that nonfiction should not be limited by traditional techniques. Born in New York City in 1945, Kidder attended Harvard University and served in Vietnam, where he documented his experiences in My Detachment, a memoir that offered insights into the lives of support troops.

The traditional cold war diplomacy of brinkmanship, characterized by carefully balanced standoffs and rules-based international order, has given way to a world in freefall. This shift is exemplified by the ever-widening conflict in the Gulf where strategic objectives remain as unclear as the potential endpoint of hostilities.Approaching a month since the United States and Israel launched attacks on Iran, the stated objectives of removing the country's nuclear threat and destroying its ballistic missile capability appear increasingly disconnected from the disproportionate impact on civilians and neighboring Gulf nations. Despite these consequences, the Iranian regime's willingness to escalate the conflict shows no signs of diminishing.The Guardian Weekly's coverage examines this critical juncture through multiple perspectives. Patrick Wintour recounts the pivotal week when global tensions reached a tipping point, while Richard Partington analyzes the long-term economic implications of a prolonged conflict, from oil price fluctuations to inflationary pressures and economic growth impacts. From South Lebanon, William Christou reports on healthcare professionals caught in the crossfire of Israeli airstrikes, highlighting the human cost of the escalating violence.Emma Graham-Harrison provides insight from Jerusalem, examining Israeli Prime Minister Benjamin Netanyahu's strategy of attempting to rehabilitate his image through what he frames as destruction of an 'axis of evil.' Meanwhile, Simon Tisdall poses a critical question: when US President Donald Trump eventually seeks to halt the conflict, will any parties be willing to heed his calls for de-escalation?Beyond the primary geopolitical focus, this week's Guardian Weekly edition explores several significant developments across different sectors. The UK political landscape features an examination of the upcoming local elections, where voter sentiment appears increasingly focused on rejecting established parties rather than actively supporting alternatives. The scientific section explores innovative approaches to addressing snoring disorders through CPAP machines, while the culture section features an in-depth interview with Dave Grohl discussing Foo Fighters, personal challenges, and grief following the loss of bandmate Taylor Hawkins.In sports, the publication celebrates the remarkable achievement of British athletes Keely Hodgkinson, Georgia Hunter Bell, and Molly Caudery, who each secured gold medals at the world indoor athletics championships in Poland, showcasing British excellence in track and field events.

The UK government is set to trial social media curbs for teenagers in a major study aimed at understanding the impact of reduced social media use on young people's lives. Hundreds of UK teenagers will participate in the six-week pilot, which will test different restrictions on social media use, including bans, digital curfews, and time limits on popular apps like Instagram, TikTok, and Snapchat.The trial, led by the UK government, will involve 300 teens across all four nations of the UK, with some participants having their social apps disabled, while others will have access blocked overnight or capped to one hour's use. The goal is to gather evidence on how different restrictions affect young people's day-to-day lives.Technology Secretary Liz Kendall emphasized the importance of testing different options in the real world, stating that the pilots will provide the evidence needed to take the next steps, informed by the experiences of families themselves.The pilot is part of a broader effort to address concerns about the mental health risks associated with unfettered internet access. Nearly 30,000 parents and children have responded to the government's digital wellbeing consultation, which closes on May 26. An independent study, funded by the Wellcome Trust, will also examine the impact of reducing social media use among adolescents.The study, involving about 4,000 students between the ages of 12 and 15 from 10 Bradford secondary schools, will investigate changes in anxiety and sleep quality, time spent with friends and family, wellbeing, body image, social comparison, school absences, and bullying.The UK government faces pressure to follow Australia's move to ban access to social media sites for under-16s, with France, Spain, and Indonesia also considering similar bans. The European parliament has passed a resolution on age restrictions, although it is not legally binding.Critics argue that the pilot is a half-measure that puts pressure on parents rather than holding big tech accountable for the harm caused by social media. Bereaved parents have written to parliamentarians, urging them to support a ban and expressing concern about the consultation process.

The modern cricket calendar has been likened to a game of Tetris that has gone awry, with players facing an intense schedule that leaves little room for recovery or emotional processing. This has significant implications for their mental wellbeing and performance. Elite cricketers, such as New Zealand's Mitchell Santner, are expected to bounce back quickly from defeats, often playing matches just days apart. Santner's team, the Black Caps, suffered a 96-run loss to India in the T20 World Cup final on March 8, and Santner was back in action just seven days later against South Africa. Mental skills coach Maurice Duffy notes that recovery from emotional trauma can take weeks or months, but cricketers are often given only days to process their emotions. Duffy emphasizes the importance of balance and 'reset' for players to maintain their performance and mental health. The issue is not just the volume of cricket, but also the emotional demands of the game. Players are expected to process failure, challenge, and disappointment quickly and then perform at a high level. This can lead to burnout, which is not just about playing too much cricket, but also about playing without meaning. The Indian Premier League (IPL) is set to start just three weeks after the T20 World Cup, which is a relatively generous turnaround compared to previous years. The IPL's rapid start highlights the packed schedule and the challenges it poses for player wellbeing and fan engagement. Experts argue that the constant grind of the modern calendar takes a toll on players and fans alike. With so many matches and competitions, it can be difficult for fans to keep up and invest in bilateral series that often seem inconsequential. Ultimately, finding a balance between competition and recovery is crucial. As Duffy points out, athletes need to find their 'why' – their purpose and motivation – to maintain their effort and engagement in the face of a demanding schedule.

According to a report by IQAir, a Swiss air quality monitoring firm, Pakistan was the world's smoggiest country in 2025 with concentrations of hazardous fine particles known as PM2.5 up to 13 times higher than the World Health Organization's (WHO's) recommended level.The report, which sourced data from 9,446 cities in 143 countries, regions and territories, found that only 13 countries and territories managed to keep their average fine particulate levels below the WHO guideline, an increase from seven in 2024.Pakistan's PM2.5 level was 67.3 microgrammes per cubic metre, significantly exceeding the WHO standard of 5 microgrammes per cubic metre. In comparison, Pakistan's average PM2.5 concentration in 2024 was 73.7 microgrammes.Prolonged exposure to PM2.5 has been linked to higher likelihoods of neurodegenerative conditions, including dementia, Parkinson's disease and Alzheimer's disease.Bangladesh and Tajikistan ranked second and third on IQAir's list of the most polluted countries while Chad, statistically the smoggiest country in 2024, was in fourth place in 2025.The report also noted that Loni, a city in northern India, was identified as the world's most polluted city in 2025 with average PM2.5 levels of 112.5 microgrammes per cubic metre.Globally, only 14 percent of cities met the WHO air quality standard in 2025, down from 17 percent a year earlier. The report highlighted that wildfires, driven by climate change, were a key factor behind worsening global air quality in 2025 as record levels of biomass burning in Europe and Canada released about 1,380 megatonnes of carbon.