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The U.S. military announced that, starting at 14:00 GMT on Monday, it will enforce a blockade of every Iranian port, a step taken after President Donald Trump ordered a naval closure of the Strait of Hormuz—the waterway through which roughly one‑fifth of global crude oil normally flows. The blockade comes on the heels of stalled peace negotiations in Islamabad, where talks between Washington and Tehran collapsed without an agreement despite a prior cease‑fire pledge. Trump’s escalation has already driven crude prices above $100 per barrel and unsettled Asian equity markets, with the Nikkei 225 down 0.84%, the Topix slipping 0.42% and South Korea’s Kospi falling 1.83%. Iran’s response is equally forceful. The Islamic Revolutionary Guard Corps warned that any vessel entering the strait would be deemed a breach of the cease‑fire and dealt with “harshly and decisively,” insisting it has “full control” and threatening a “deadly vortex” for any misstep. Navy chief Shahram Irani dismissed Trump’s threat as “ridiculous and funny,” while state television said Iranian forces are closely monitoring U.S. movements. Foreign Minister Abbas Araghchi lamented “maximalism, shifting goalposts, and blockade” that undermined a near‑final Islamabad memorandum, quoting, “Good will begets good will. Enmity begets enmity.” Parliament speaker Mohammad Bagher Ghalibaf pledged resistance and mocked U.S. gasoline prices, posting a map of Washington‑area pump prices and predicting nostalgia for $4‑$5 gas. U.S. Central Command clarified that the blockade will stop all vessels bound for or from Iran, while traffic to non‑Iranian ports will continue unhindered. Trump also warned that any ship that has paid an “illegal toll” to Iran will be intercepted on the high seas, and he publicly criticized Pope Leo XIV for urging an end to the conflict. In Lebanon, Israeli airstrikes have killed at least five people, bringing the country’s overall death toll to 2,055. Hezbollah retaliated with a rocket barrage aimed at northern Israeli towns, citing violations of a cease‑fire. The United Nations Interim Force in Lebanon (UNIFIL) reported that an Israeli tank rammed peace‑keeping vehicles twice in the south. Israel’s Prime Minister Benjamin Netanyahu visited troops on the Lebanese border, claiming that Hezbollah’s invasion threat has been neutralized, though he acknowledged that hostilities continue within the security zone. On the energy front, shipping through the Hormuz corridor has “immediately halted,” according to Lloyd’s List, with several vessels turning back after the blockade announcement, further tightening global oil supplies.

Australia announced that Lieutenant General Susan Coyle will assume the role of chief of the Australian Army in July, marking the first time a woman has held the post in the service’s 125‑year history.Coyle, currently chief of joint capabilities, brings nearly four decades of experience, including senior command roles in Afghanistan and the Middle East, and expertise in cyber‑warfare. She will succeed Lieutenant General Simon Stuart, who took the position in July 2022.Prime Minister Anthony Albanese hailed the appointment as a historic breakthrough, stating, "From July, we will have the first ever female chief of army in the Australian Army’s 125‑year history." Defence Minister Richard Marles called the move a "deeply historic moment" and emphasized its symbolic power: "You cannot be what you cannot see."The appointment arrives as the Australian Defence Force (ADF) intensifies efforts to raise female participation. Women currently constitute about 21 % of the ADF and 18.5 % of senior leadership roles, with a target of 25 % overall participation by 2030.In October, a class‑action lawsuit alleged that the ADF failed to protect thousands of women officers from systematic sexual assault, harassment, and discrimination, underscoring the urgency of cultural reform alongside the leadership change.Alongside Coyle’s promotion, Vice Admiral Mark Hammond, the incumbent chief of the navy, will become the head of the ADF, succeeding Admiral David Johnston. Rear Admiral Matthew Buckley is set to replace Hammond as navy chief.The army is also undergoing a major transformation, investing in long‑range firepower, drones, and other modern combat tools. Coyle’s background in cyber‑warfare is expected to bolster the force’s capability to operate in increasingly digitised battlefields.

The United States military confirmed that, beginning at 10 a.m. Eastern Time (14:00 GMT) on April 13, all maritime traffic entering or leaving Iranian ports will be blocked. The directive, issued by U.S. Central Command (CENTCOM), targets vessels of every nation operating in the Gulf and the Gulf of Oman, but explicitly excludes ships merely transiting the Strait of Hormuz to non‑Iranian ports, marking a narrower scope than former President Donald Trump’s broader strait‑wide threat. This decisive action follows the abrupt end of marathon peace talks in Islamabad, where negotiators failed to secure a memorandum of understanding with Tehran. The stalemate has revived fears of renewed hostilities, prompting the U.S. to leverage maritime pressure as a bargaining chip. Financial markets reacted sharply: U.S. crude oil prices surged 8 % to $104.24 per barrel, while the benchmark Brent crude rose 7 % to $102.29. The spikes reflect investor anxiety over potential disruptions to the flow of oil and liquefied natural gas that currently passes through the Strait of Hormuz, a chokepoint responsible for roughly one‑fifth of global energy shipments. Since the February 28 launch of a joint U.S.–Israel operation against Iran, the strait’s traffic has dwindled to a trickle. Iran continues to navigate its own vessels and has allowed limited passage for foreign ships, while discussing a post‑conflict toll system for the waterway. In response to the blockade threat, Iran’s Islamic Revolutionary Guard Corps warned that any U.S. warship attempting to enforce the measure would breach the existing U.S.–Iran ceasefire—set to expire on April 22—and would be "dealt with severely." Iranian Foreign Minister Abbas Araghchi blamed the United States for the diplomatic failure, accusing U.S. negotiators of "shifting the goalposts" when a deal was "just inches away." Academic commentary echoed regional concerns. Zohreh Kharazmi, an associate professor at the University of Tehran, asserted that the United States "is not in a position to dictate" Iranian maritime movements and warned that a prolonged standoff would quickly reveal which side—"the resilience of the Islamic Republic or the resilience of global markets"—would suffer first. While the blockade targets Iranian ports, CENTCOM emphasized that it will not impede freedom of navigation for vessels merely passing through the Strait of Hormuz, a subtle but significant concession aimed at avoiding a full‑scale maritime confrontation.

Oil prices experienced a significant surge following US President Donald Trump's announcement of a naval blockade on Iran. Brent crude, the international benchmark, rose more than 8 percent to top $103 a barrel on Sunday.The blockade, which was later clarified by US Central Command to only affect vessels traveling to and from Iran, is set to take effect on Monday at 10am Eastern Time (14:00 GMT). This move has heightened uncertainty in global financial markets, with major stock markets in Asia opening lower on Monday.The Strait of Hormuz, a critical conduit for about one-fifth of global oil and natural gas supplies, has been a focal point of tensions between the US and Iran. Despite a fragile truce between the two nations, only 17 vessels crossed the strait on Saturday, down from roughly 130 daily transits before the conflict.The blockade threat has stoked fears of supply disruptions, contributing to the rise in oil prices. This development comes after oil prices had fluctuated significantly in recent weeks, topping $119 last month before falling below $92 a barrel last week.Global markets are closely watching the situation, with US stock futures and Asian markets experiencing declines. Japan's benchmark Nikkei 225 fell 0.9 percent, while South Korea's KOSPI dropped more than 1 percent.

Donald Trump's military approach against Iran has backfired, emboldening the country rather than weakening it. The 16-hour talks in Pakistan, led by JD Vance, failed to extract a quick accord, highlighting the complexity of issues between Washington and Tehran. The Israeli Prime Minister, Benjamin Netanyahu, had sold the war to Trump as an opportunity for regime change. However, Trump's plan had no clear strategy beyond killing senior Iranian officials, which only strengthened hardliners within the regime. Trump's goal of destroying Iran's military capacity has also failed. US intelligence indicates that Iran's ability to replenish its missiles and drones remains considerable. Furthermore, Iran is causing significant damage to Gulf states. The main issue remains Iran's nuclear program. The 2015 accord, negotiated by Barack Obama, had required Iran to limit its nuclear activities, but Trump withdrew from the deal in 2018. Today, Iran has nearly 900lb of highly enriched uranium, which could be further refined into a nuclear bomb. Trump's aggressive approach has handed Iran a new weapon: the ability to close the Strait of Hormuz, a critical waterway for international shipping. This move could wreak havoc on the world economy and give Iran significant revenue through tolls. The article concludes that diplomacy is the only viable solution to the conflict. Negotiation requires compromise and give-and-take, which Trump has so far resisted. The stakes are high, with the potential for genocide and massive war crimes. The door to a deal remains open, but it demands a willingness to negotiate in good faith.

Tanya Khovanova has long been a leading voice in the world of recreational mathematics, authoring a popular blog and running the Number Gossip site where enthusiasts can inquire about any number.She now debuts her first book, Mathematical Puzzles and Curiosities, co‑written with fellow puzzle‑enthusiasts Ivo David and Yogev Shpilman. Published by World Scientific, the volume offers fresh challenges and inventive twists on classic problems.To give readers a taste, Khovanova selected three puzzles for the Guardian column:1. Battleships – As a naval admiral you must choose between sending a single vessel with a success probability of P % or two vessels each with a P/2 % chance, where the mission succeeds if at least one ship does. Which strategy maximises the odds?2. The Two Oracles – You face two respondents, Randie, who answers randomly, and Rando, who randomly decides to tell the truth or lie before each answer. Is there a method to distinguish them?3. Bad Maths – A student computes 5548 − 5489 as 59, claiming the “548” cancels out. He then experiments with a subtraction of the form XXYZ − XYZW (distinct digits) and observes the result is XW. How many digits in the new expression match those in the original calculation?Solutions to the trio were later posted online (update), but readers were urged to avoid spoilers until the scheduled reveal.Khovanova also reminds fans that she has been curating puzzles for the Guardian every other Monday since 2015 and welcomes new submissions via email.

Liverpool FC is gearing up for a crucial Champions League showdown against Paris Saint-Germain, with manager Arne Slot expressing confidence in his team's ability to turn the tide in their favor. The Reds are facing a daunting task, having lost 2-0 in the first leg at Parc des Princes.Slot emphasized that his team must deliver a great performance to overcome the European champions, stating that while the task is complicated, it is not impossible. He drew on his team's past successes, highlighting that in 36 of their 50 home games under his management, Liverpool has scored two or more goals.The Liverpool head coach is instilling belief in his players, citing examples of their ability to perform at a high level, even against strong opponents. He noted that his team has shown resilience in the face of adversity, such as coming back from 4-0 down against Manchester City in the FA Cup.Dominik Szoboszlai, Liverpool's midfielder, echoed Slot's sentiments, urging his teammates to go 'all in' from the first minute to the final whistle to knock out PSG. Szoboszlai expressed his desire to secure a win, stating that anything can happen at Anfield in a one-off game.Meanwhile, PSG's manager, Luis Enrique, warned his players not to underestimate Liverpool, cautioning that there could be pitfalls and that the game can change quickly. He emphasized the importance of taking care of details and not allowing Liverpool to benefit from their home crowd and noise.

For the first time, thousands of cancer patients from Black and minority ethnic backgrounds will benefit from an enhanced genetic test offered by the NHS. The new screening expands the panel of DPYD gene variants from four to five, directly addressing a long‑standing bias that left non‑white patients vulnerable to dangerous chemotherapy side‑effects. In England, patients slated for chemotherapy undergo a genetic check that can guide dose adjustments and mitigate adverse reactions such as mouth sores, hair loss, nausea, fatigue, and, in severe cases, death. Up to 40% of the 38,000 individuals receiving fluoropyrimidine‑based chemotherapy each year experience a harmful drug reaction. Previously, the test only targeted four DPYD variants common in people of European descent, meaning many Black patients received inaccurate “all‑clear” results. The addition of a fifth variant—more prevalent among African, Caribbean and other minority groups—means clinicians can now identify patients at risk who were previously missed. Since its rollout at Manchester University NHS Foundation Trust last September, three minority‑ethnic patients have had their initial chemotherapy doses adjusted, lowering their chance of a potentially fatal reaction. Dr Veline L’Esperance, senior clinical adviser at the NHS Race and Health Observatory, called the change “tangible results for patients who have historically been left behind.” She emphasized that the update shifts the discussion on ethnic health inequality from rhetoric to actionable care. Prof Habib Naqvi, chief executive of the NHS Race and Health Observatory, described the development as a “groundbreaking outcome” for chemotherapy safety, while noting that ethnic minorities remain under‑represented in genomic research and biobanks. He warned that broader inclusion is essential for the promised benefits of precision medicine to reach all communities. Prof Dame Sue Hill, chief scientific officer for NHS England, highlighted the significance of discovering the fifth variant: “Personalising chemotherapy based on genetics can save lives and reduce harmful side‑effects, especially for patients of African ancestry.” She added that the North West NHS Genomic Medicine Service has already demonstrated the practical impact of this approach. These steps come amid broader evidence that minority patients in the UK face longer diagnostic waits, more GP visits before a cancer diagnosis, and lower perceived support during treatment. The expanded DPYD test represents a concrete effort to close those gaps and ensure equitable, science‑driven care for all cancer patients.

At 19,000 miles above the lunar surface, the Artemis II astronauts heard the voice of Apollo‑13 commander Jim Lovell greeting them from beyond the grave, a message recorded shortly before his death at 97. Mission control transmitted the tribute on the morning of 6 April, when astronaut Reid Wiseman held a silk square bearing the original Apollo 8 patch—handed to him by Lovell’s son—before the crew’s launch. Launch director Charlie Blackwell‑Thompson secured a unanimous "go" from every console, a moment the author describes as a snapshot of humanity’s capacity to honor the past while reaching for the future. The ceremony stood in stark contrast to the Pentagon’s agenda. Two decades after a 2006 Iraqi kill‑board note reading “Let the bodies hit the floor,” the current defense chief pledged “death and destruction from the sky all day long” against Iran, a stance legal scholars warn could constitute a war crime. That rhetoric accompanies a proposed $1.5 trillion defense budget, including an additional $200 billion earmarked for operations against Iran—figures that dwarf NASA’s entire annual budget of $24.4 billion. Amid this fiscal disparity, crew members reflected on their place in history. Victor Glover, the first Black astronaut to travel deep space, described the view of Earth as an "oasis" in the void, while Christina Koch, the first woman to orbit the Moon, pressed her face to the window and formed a heart with her hands, calling the mission’s spirit "humility." Reid Wiseman watched the planet rotate beneath him, noting the sight of Africa, Europe, and the aurora‑lit north, saying it "paused all four of us in our tracks." Canadian astronaut Jeremy Hansen broke Jim Lovell’s 56‑year distance record and asked mission control to name a lunar feature after his late wife, Carroll. The crew agreed, designating a bright spot on the Moon as "Carroll," a tribute that will endure beyond any single lifetime. When Koch announced the spacecraft’s descent, she radioed, "We are now falling to the moon rather than rising away from Earth," a poetic reversal that underscored the mission’s symbolic return. The article recalls the author’s 2022 reflection on the James Webb Space Telescope, noting how humanity’s finest inventions now aim outward, seeking answers to our origins rather than turning inward toward conflict. Artemis II’s vessel, named Integrity, carried four breathing humans who, in a moment of collective grief, pressed their faces to the glass and imagined the faces of every loved one ever lived, captured in a single frame. Beyond the spacecraft, cultural threads wove through the mission: Hansen’s patch displayed the Seven Sacred Teachings of the Anishinaabe people, and the Chinese myth of Chang’e reminded viewers of the Moon’s timeless allure. As Carl Sagan famously wrote, "We are made of star‑stuff," the Artemis crew embodied that sentiment—not as passive observers, but as active participants in a fragile, hopeful narrative that rises above the relentless tally of bodies on Earth’s battlefields.