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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.

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.

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.

Oil prices jumped back above $100 a barrel and global stocks fell after weekend talks between the US and Iran ended without an agreement and Donald Trump imposed a blockade of the Strait of Hormuz. The US president announced the blockade on Sunday, targeting Iranian vessels and ships that have paid a toll to Iran for passage through the strait, in an attempt to choke off the flow of Iranian oil.US Central Command said it would start at 10am ET (5.30pm in Iran and 3pm in the UK), blocking all Iranian Gulf ports and coastal areas, in effect seizing control of maritime traffic in the Strait of Hormuz. The news drove oil and gas prices sharply higher again, after the two-week ceasefire between the US and Iran announced on Wednesday prompted a sharp fall in energy prices, and crude ended the week below the psychological $100 a barrel threshold.Brent crude rose by nearly 7% to $101.74 a barrel on Monday morning, while US crude is up more than 8% to $104.69 a barrel. Gas prices also increased, with the British wholesale gas contract for May soaring by 11.7% to 122.5p a therm. Analysts at JPMorgan Chase said last week they expected oil prices to stay high in the second quarter, above $100 a barrel, before easing in the second half of the year.Most Asian stock markets fell on Monday, with Japan’s Nikkei down 0.7% and Hong Kong’s Hang Seng index losing 1%, while Chinese stocks rose slightly. Sentiment was helped by Beijing’s announcement of a 10-initiative strategy aimed at deepening ties with Taiwan. European stocks also fell, led by airlines including Lufthansa, Wizz Air, easyJet and British Airways parent IAG. The FTSE 100 index in London lost 0.4%, dropping 45 points to 10,555. Germany’s Dax fell 1%, Italy’s FTSE MiB slipped 0.7% and Spain’s Ibex was down 1.1%. With oil and gas prices rising sharply higher, energy companies such as BP and Shell are rallying.Priyanka Sachdeva, senior market analyst at the broker Phillip Nova, said: “In today’s environment, every barrel of risk added to oil markets carries an inflation price tag for the global economy.” She added: “The market reaction underscores a simple but powerful reality: Hormuz risk is not theoretical; it is structural, and it is real.”Interest rate expectations have shifted again; investors now see an 84% chance of two rate increases from the Bank of England this year to tackle rising inflation, up from 60% on Friday. Before the Iran war, the central bank was expected to cut rates. The price of gold fell 0.4% to $4,730.75 an ounce as the blockade fuelled inflation concerns, prompting traders to scale back expectations for Federal Reserve rate cuts this year.

The ongoing US-Israel war on Iran has taken a critical turn with Donald Trump's announcement that the US Navy would start blockading the Strait of Hormuz. This strategic waterway is crucial for global oil shipments, and any disruption could have significant economic impacts. In response, Iran's Revolutionary Guard warned that approaching military vessels to the strait would be considered a violation of the ceasefire. This development has led to a surge in oil prices, with US crude oil rising 8% to $104.24 a barrel and Brent crude oil increasing 7% to $102.29. The blockade, set to begin on Monday morning, will be implemented by US Central Command (Centcom) and will affect all maritime traffic entering and exiting Iranian ports. This move is part of a broader strategy that may include resuming limited military strikes in Iran, according to reports. The situation has drawn international attention, with Australian Prime Minister Anthony Albanese stating that his government has not been asked to participate in the blockade and is keen on continuing negotiations between the US and Iran. Meanwhile, Iranian parliamentary speaker Mohammad Bagher Ghalibaf dismissed Trump's threats, asserting that they would have no effect on the Iranian nation.

The US has announced plans to blockade the Strait of Hormuz, a vital waterway through which about 20% of global oil passes. This move comes after ceasefire talks with Iran ended without an agreement over the weekend. The blockade, threatened by President Donald Trump, aims to pressure Iran into reopening the strait, which has been effectively closed since February 28. Trump's announcement on social media stated that the US Navy will begin the process of blockading any and all ships trying to enter or leave the Strait of Hormuz. He accused Iran of 'WORLD EXTORTION' and threatened that any person who attacked US vessels would be 'BLOWN TO HELL!' However, the blockade's scope appears to have been scaled down, with US Central Command (Centcom) stating it would be confined to vessels transiting through Iranian ports, permitting passage of ships headed to ports belonging to America's Gulf allies. The blockade is set to come into effect at 10am ET (2pm GMT). The UK will not be involved in any blockade of the strait, and Australian Prime Minister Anthony Albanese has stated that his country was not asked to participate. Oil prices have surged following Trump's announcement, with US crude increasing 8% to $104.24 a barrel and Brent crude oil rising 7% to $102.29. Experts warn that the blockade could lead to higher oil prices, but much depends on its 'scope and implementation.' The managing director of research at ClearView Energy Partners, Kevin Book, noted that leaner volumes generally mean tighter markets and higher prices. Iranian and/or Houthi reprisals against Gulf producers' alternative routes could drive prices still higher. The blockade could cut off one of the Iranian regime's major sources of funding but might also have a short-term negative effect on global prices. About 100 tankers have transited the strait since the US and Israel started bombing Iran, most carrying Iranian oil products bound for China and India. Iran's Revolutionary Guards have stated that any warships approaching the strait to enforce a blockade would be considered in breach of the current ceasefire and would be dealt with strongly. Trump floated the possibility of a resumption of US strikes inside Iran, citing missile factories as one possible target.

International activists are preparing to set sail from northeastern Spain to the Gaza Strip in a massive 70-boat flotilla, aiming to break Israel's devastating naval blockade and deliver much-needed humanitarian aid.The initiative, dubbed the 'Global Resilience Flotilla,' boasts a significant increase in participation, with about 1,000 volunteers from 70 countries taking part in the effort. The vessels, departing from the port of Barcelona, are loaded with food, medicine, school bags, and stationery for Palestinian children.Organisers say the mission is being carried out in coordination with Palestinian civil society organisations, maritime security experts, and prominent international NGOs, including Greenpeace and Open Arms—a charity known for its Mediterranean rescue operations. The flotilla has also received increased backing from the Barcelona municipality.Pablo Castilla, a spokesperson for the flotilla, told reporters in Barcelona that the primary goal is to 'condemn international complicity in the genocide committed by Israel in Gaza, demand accountability, and open a humanitarian corridor by sea and land'.Castilla noted a declining international focus on Gaza due to the ongoing United States-Israel war on Iran and Israeli attacks on Lebanon. He warned that Israel is exploiting this geopolitical shift to tighten its siege, restrict aid, expand settlements, and accelerate the occupation of Palestinian territory.The Gaza Strip, under an Israeli blockade since 2007, has faced an unprecedented humanitarian and health crisis since Israel's genocidal war against Palestinians in Gaza, which began in October 2023 and has killed more than 72,000 Palestinians.The prolonged assault has also devastated infrastructure, including hospitals, and left approximately 1.5 million of the enclave's 2.4 million residents displaced and homeless, amid severe restrictions on fuel and medical supplies.Since 2010, all flotillas attempting to break the Gaza blockade have been intercepted or attacked by Israel in international waters.

President Donald Trump declared that the U.S. Navy will commence a blockade of the Strait of Hormuz immediately after peace talks between Washington and Tehran in Pakistan ended without an agreement. In a social‑media post, Trump labeled Iran’s actions as “extortion” and warned that American warships would hunt down and interdict any ship that has paid Iran a toll to traverse the waterway, while also beginning mine‑clearing operations. Iran’s Revolutionary Guard responded that civilian vessels may still cross the strait under “specific regulations,” but any military craft attempting entry would be deemed a breach of the cease‑fire and would be “dealt with severely.” Since the February 28 war launched by the United States and Israel, Iran has effectively taken control of the strategic chokepoint, a route that carries about 20% of the world’s oil and liquefied natural gas shipments. Traffic has now dwindled to a trickle, sending shockwaves through the global economy and raising alarm among Gulf Cooperation Council (GCC) states. Al Jazeera correspondents noted that the rhetoric from the White House has amplified “alarm bells” across the GCC, where leaders had hoped the two‑week ceasefire would evolve into a longer‑term peace framework. Oman’s foreign minister, Badr Albusaidi, urged on social media that the ceasefire be extended and that all parties make “painful concessions” to avoid a return to war. Trump’s statements also included a stark threat: any Iranian forces that fire on U.S. or “peaceful” vessels would be “blown to hell.” He claimed the blockade would involve “other countries” and that the United Kingdom, along with “a couple of other nations,” were dispatching minesweeper vessels to assist – a claim the British government has not confirmed. Domestic criticism emerged quickly. Democratic Senator Mark Warner told CNN he “doesn’t see how blockading the strait will compel Iran to open it,” questioning the strategic logic behind the move. Iran denied U.S. allegations that two of its warships had recently passed through the strait for mine‑clearing, warning that any military vessel attempting such a passage would meet a “strong response.” Tehran officials have floated the idea of instituting a post‑conflict toll system for vessels using the waterway, a prospect that could further entrench Iran’s leverage over global energy flows. Analysts warn that heightened tensions in the Hormuz corridor could push oil prices higher, amplifying inflationary pressures worldwide. As the situation unfolds, mediators continue to press both sides to resume diplomatic talks and avoid a broader escalation.

Tehran – Iranian officials warned that the United States must increase pressure for any peace agreement while urging their supporters to keep the streets under control.Parliament speaker Mohammad Bagher Ghalibaf said the US delegation in Islamabad “failed to gain the trust of the Iranian delegation” during the marathon talks.US President Donald Trump announced an immediate naval blockade of the Strait of Hormuz and declared that US forces are “locked and loaded” to finish Iran at the “appropriate moment.”Iran hailed the delegation’s refusal to accept Washington’s core demands – ending nuclear enrichment and relinquishing control of the Strait – as a sign of defiant resolve.Judiciary chief Gholam‑Hossein Mohseni‑Ejei thanked the Islamabad team for “guarding the rights” of government supporters, including paramilitary forces that have been gathering in Tehran’s main squares for more than six weeks.State television aired an IRGC aerospace officer urging flag‑waving crowds not to worry, stating, “If the enemy does not understand, we will make them understand,” which was met with cheers demanding more missile and drone attacks.Iranian officials blamed Trump’s “excessive demands” for the talks’ failure, noting the Ministry of Foreign Affairs did not expect an agreement after a single day of negotiations.Hard‑line parliamentarians expressed satisfaction with the stalemate, viewing Iran as holding the upper hand. Deputy speaker Hamidreza Haji‑Babaei said only a UN Security Council resolution signalling US surrender would lift sanctions on Iran.Lawmaker Amir Hossein Sabeti of the Paydari faction thanked the negotiating team for standing by red lines and called for “resistance in the field against these evildoers.”The sudden announcement of a two‑week cease‑fire left pro‑state voices disappointed; local media reported the Iranian delegation numbered over 85 members, including state‑affiliated journalists and factional analysts.The talks confirmed that a diplomatic breakthrough was not imminent and hinted at further escalation, though not necessarily a return to full‑scale fighting.National security commission head Ebrahim Azizi dismissed Trump’s blockade threats as “excessive talk.”The IRGC warned it would meet any vessel passing the Strait of Hormuz with “full force” and rejected US claims that two warships had already transited the waterway.Russian President Vladimir Putin told Iranian President Masoud Pezeshkian he remains ready to facilitate a Middle‑East peace settlement.Pezeshkian, focused on domestic affairs, reaffirmed support for Supreme Leader Ayatollah Ali Khamenei and announced that schools and universities will continue online via a limited intranet.Iran’s economy continues to suffer from chronic inflation, rising unemployment and a near‑total internet shutdown, deepening public hardship.