You hear that? The heavy thudding sound of someone running for their lives? Running around at the speed of sound, perhaps? Maybe this person, sprinting as far as their body can carry them, has places to go and has to follow his rainbow? That person i

Remember that Prince of Persia: The Sands of Time remake Ubisoft announced back in 2020? The one that was supposed to launch four years ago? Well, it’s still in development according to a new update from the publisher after the game was a no-show dur

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Monster Hunter Wilds, Sinister Cloth, Monster Hunter armor, unique materials, cool armor designs, Monster Hunter series, crafting armor, hunting monsters, gaming gear ## Introduction: The Quest for the Ultimate Armor Ah, Monster Hunter Wilds, a game where you can spend countless hours chasing down gigantic beasts, only to discover that your real enemy isn’t the monster lurking in the bushes,...

Game Pass – will it continue forever? (Microsoft) The Monday letters page struggles to predict what’s going to happen with the PlayStation 6, as one reader sees their opinion of the Switch 2 change over time. To join in with the discussions yourself email gamecentral@metro.co.uk Final Pass I agree with a lot of what was said about the current state of Xbox in the Reader’s Feature this weekend and how the more Microsoft spends, and the more companies they own, the less the seem to be in control. Which is very strange really.The biggest recent failure has got to be Game Pass, which has not had the impact they expected and yet they don’t seem ready to acknowledge that. If they’re thinking of increasing the price again, like those rumours say, then I think that will be the point at which you can draw a line under the whole idea and admit it’s never going to catch on. But would Microsoft ever shut down Game Pass completely? I feel that would almost be more humiliating than stopping making consoles, so I can’t really imagine it. Instead, they’ll make it more and more expensive and put more and more restrictions on day one games until it’s no longer recognisable.Grackle Panic button Strange to see Sony talking relatively openly about Nintendo and Microsoft as competition. I can’t remember the last time they mentioned either of them, even if they obviously would prefer not to have, if they hadn’t been asked by investors.At no point did they acknowledge that the Switch has completely outsold both their last two consoles, so I’m not sure where their confidence comes from. I guess it’s from the fact that they know they’ve done nothing this gen and still come out on top, so from their perspective they’ve got plenty in reserve. Expert, exclusive gaming analysis Sign up to the GameCentral newsletter for a unique take on the week in gaming, alongside the latest reviews and more. Delivered to your inbox every Saturday morning. Having your panic button being ‘do anything at all’ must be pretty reassuring really. Nintendo has had to work to get where they are with the Switch but Sony is just coasting it.Lupus James’ LadderJacob’s Ladder is a film I’ve been meaning to watch for a while, and I guessed the ending quite early on, but it feels like a Silent Hill film. I don’t know if you guys have seen it but it’s an excellent film and the hospital scene near the end, and the cages blocking off the underground early on, just remind me of the game. A depressing film overall but worth a watch.Simon GC: Jacob’s Ladder was as a major influence on Silent Hill 2 in particular, even the jacket James is wearing is the same. Email your comments to: gamecentral@metro.co.uk Seeing the future I know everyone likes to think of themselves as Nostradamus, but I have to admit I have absolutely no clue what Sony is planning for the PlayStation 6. A new console that is just the usual update, that sits under your TV, is easy enough to imagine but surely they’re not going to do that again?But the idea of having new home and portable machines that come out at the same time seems so unlikely to me. Surely the portable wouldn’t be a separate format, but I can’t see it being any kind of portable that runs its own games because it’d never be as powerful as the home machine. So, it’s really just a PlayStation Portal 2? Like I said, I don’t know, but for some reason I have a bad feeling about that the next gen and whatever Sony does end up unveiling. I suspect that whatever they and Microsoft does it’s going to end up making the Switch 2 (and PC) seem even more appealing by comparison.Gonch Hidden insight I’m not going to say that Welcome Tour is a good game but what I will say is that I found it very interesting at times and I’m actually kind of surprised that Nintendo revealed some of the information that they did. Most of it could probably be found out by reverse engineering it and just taking it apart but I’m still surprised it went into as much detail as it did.You’re right that it’s all presented in a very dull way but personally I found the ‘Insights’ to be the best part of the game. The minigames really are not very good and I was always glad when they were over. So, while I would not necessarily recommend the game (it’s not really a game) I would say that it can be of interest to people who have an interest in how consoles work and how Nintendo think.Mogwai Purchase privilege I’ve recently had the privilege of buying Clair Obscur: Expedition 33 from the website CDKeys, using a 10% discount code. I was lucky enough to only spend a total of £25.99; much cheaper than purchasing the title for console. If only Ubisoft had the foresight to see what they allowed to slip through their fingers. I’d also like to mention that from what I’ve read quite recently ,and a couple of mixed views, I don’t see myself cancelling my Switch 2. On the contrary, it just is coming across as a disappointment.From the battery life to the lack of launch titles, an empty open world is never a smart choice to make not even Mario is safe from that. That leaves the upcoming ROG Xbox Ally that’s recently been showcased and is set for an October launch. I won’t lie it does look in the same vein as the Switch 2, far too similar to the ROG Ally X model. Just with grips and a dedicated Xbox button. The Z2 Extreme chip has me intrigued, however. How much of a transcendental shift it makes is another question however. I’ll have to wait to receive official confirmation for a price and release date. But there’s also a Lenovo Legion Go 2 waiting in the wings. I hope we hear more information soon. Preferably before my 28th in August.Shahzaib Sadiq Tip of the iceberg Interesting to hear about Cyberpunk 2077 running well on the Switch 2. I think if they’re getting that kind of performance at launch, from a third party not use to working with Nintendo hardware, that bodes very well for the future.I think we’re probably underestimating the Switch 2 a lot at the moment and stuff we’ll be seeing in two or three years is going to be amazing, I predict. What I can’t predict is when we’ll hear about any of this. I really hope there’s a Nintendo Direct this week.Dano Changing opinions So just a little over a week with the Switch 2 and after initially feeling incredibly meh about the new console and Mario Kart a little more playtime has been more optimistic about the console and much more positive about Mario Kart World.It did feel odd having a new console from Nintendo that didn’t inspire that childlike excitement. An iterative upgrade isn’t very exciting and as I own a Steam Deck the advancements in processing weren’t all that exciting either. I can imagine someone who only bough an OG Switch back in 2017 really noticing the improvements but if you bought an OLED it’s basically a Switch Pro (minus the OLED). The criminally low level of software support doesn’t help. I double dipped Street Fighter 6 only to discover I can’t transfer progress or DLC across from my Xbox, which sort of means if I want both profiles to have parity I have to buy everything twice! I also treated myself to a new Pro Controller and find using it for Street Fighter almost unplayable as the L and ZL buttons are far too easy to accidently press when playing. Mario Kart initially felt like more of the same and it was only after I made an effort to explore the world map, unlock characters and karts, and try the new grinding/ollie mechanic that it clicked. I am now really enjoying it, especially the remixed soundtracks. I do however want more Switch 2 exclusive experiences – going back through my back catalogue for improved frame rates doesn’t cut it Nintendo! As someone with a large digital library the system transfer was very frustrating and the new virtual cartridges are just awful – does a Switch 2 need to be online all the time now? Not the best idea for a portable system. So, the start of a new console lifecycle and hopefully lots of new IP – I suspect Nintendo will try and get us to revisit our back catalogues first though.BristolPete Inbox also-rans Just thought I would mention that if anyone’s interested in purchasing the Mortal Kombat 1 Definitive Edition, which includes all DLC, that it’s currently an absolute steal on the Xbox store at £21.99.Nick The GreekI’ve just won my first Knockout Tour online race on Mario Kart World! I’ve got to say, the feeling is magnificent.Rable More Trending Email your comments to: gamecentral@metro.co.uk The small printNew Inbox updates appear every weekday morning, with special Hot Topic Inboxes at the weekend. Readers’ letters are used on merit and may be edited for length and content. You can also submit your own 500 to 600-word Reader’s Feature at any time via email or our Submit Stuff page, which if used will be shown in the next available weekend slot. You can also leave your comments below and don’t forget to follow us on Twitter. Arrow MORE: Games Inbox: Is Mario Kart World too hard? GameCentral Sign up for exclusive analysis, latest releases, and bonus community content. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Your information will be used in line with our Privacy Policy

June 13, 20256 min readAir-Conditioning Can Surprisingly Help the Power Grid during Extreme HeatSwitching on air-conditioning during extreme heat doesn’t have to make us feel guilty—it can actually boost power grid reliability and help bring more renewable energy onlineBy Johanna Mathieu & The Conversation US Imagedepotpro/Getty ImagesThe following essay is reprinted with permission from The Conversation, an online publication covering the latest research.As summer arrives, people are turning on air conditioners in most of the U.S. But if you’re like me, you always feel a little guilty about that. Past generations managed without air conditioning – do I really need it? And how bad is it to use all this electricity for cooling in a warming world?If I leave my air conditioner off, I get too hot. But if everyone turns on their air conditioner at the same time, electricity demand spikes, which can force power grid operators to activate some of the most expensive, and dirtiest, power plants. Sometimes those spikes can ask too much of the grid and lead to brownouts or blackouts.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.Research I recently published with a team of scholars makes me feel a little better, though. We have found that it is possible to coordinate the operation of large numbers of home air-conditioning units, balancing supply and demand on the power grid – and without making people endure high temperatures inside their homes.Studies along these lines, using remote control of air conditioners to support the grid, have for many years explored theoretical possibilities like this. However, few approaches have been demonstrated in practice and never for such a high-value application and at this scale. The system we developed not only demonstrated the ability to balance the grid on timescales of seconds, but also proved it was possible to do so without affecting residents’ comfort.The benefits include increasing the reliability of the power grid, which makes it easier for the grid to accept more renewable energy. Our goal is to turn air conditioners from a challenge for the power grid into an asset, supporting a shift away from fossil fuels toward cleaner energy.Adjustable equipmentMy research focuses on batteries, solar panels and electric equipment – such as electric vehicles, water heaters, air conditioners and heat pumps – that can adjust itself to consume different amounts of energy at different times.Originally, the U.S. electric grid was built to transport electricity from large power plants to customers’ homes and businesses. And originally, power plants were large, centralized operations that burned coal or natural gas, or harvested energy from nuclear reactions. These plants were typically always available and could adjust how much power they generated in response to customer demand, so the grid would be balanced between power coming in from producers and being used by consumers.But the grid has changed. There are more renewable energy sources, from which power isn’t always available – like solar panels at night or wind turbines on calm days. And there are the devices and equipment I study. These newer options, called “distributed energy resources,” generate or store energy near where consumers need it – or adjust how much energy they’re using in real time.One aspect of the grid hasn’t changed, though: There’s not much storage built into the system. So every time you turn on a light, for a moment there’s not enough electricity to supply everything that wants it right then: The grid needs a power producer to generate a little more power. And when you turn off a light, there’s a little too much: A power producer needs to ramp down.The way power plants know what real-time power adjustments are needed is by closely monitoring the grid frequency. The goal is to provide electricity at a constant frequency – 60 hertz – at all times. If more power is needed than is being produced, the frequency drops and a power plant boosts output. If there’s too much power being produced, the frequency rises and a power plant slows production a little. These actions, a process called “frequency regulation,” happen in a matter of seconds to keep the grid balanced.This output flexibility, primarily from power plants, is key to keeping the lights on for everyone.Finding new optionsI’m interested in how distributed energy resources can improve flexibility in the grid. They can release more energy, or consume less, to respond to the changing supply or demand, and help balance the grid, ensuring the frequency remains near 60 hertz.Some people fear that doing so might be invasive, giving someone outside your home the ability to control your battery or air conditioner. Therefore, we wanted to see if we could help balance the grid with frequency regulation using home air-conditioning units rather than power plants – without affecting how residents use their appliances or how comfortable they are in their homes.From 2019 to 2023, my group at the University of Michigan tried this approach, in collaboration with researchers at Pecan Street Inc., Los Alamos National Laboratory and the University of California, Berkeley, with funding from the U.S. Department of Energy Advanced Research Projects Agency-Energy.We recruited 100 homeowners in Austin, Texas, to do a real-world test of our system. All the homes had whole-house forced-air cooling systems, which we connected to custom control boards and sensors the owners allowed us to install in their homes. This equipment let us send instructions to the air-conditioning units based on the frequency of the grid.Before I explain how the system worked, I first need to explain how thermostats work. When people set thermostats, they pick a temperature, and the thermostat switches the air-conditioning compressor on and off to maintain the air temperature within a small range around that set point. If the temperature is set at 68 degrees, the thermostat turns the AC on when the temperature is, say, 70, and turns it off when it’s cooled down to, say, 66.Every few seconds, our system slightly changed the timing of air-conditioning compressor switching for some of the 100 air conditioners, causing the units’ aggregate power consumption to change. In this way, our small group of home air conditioners reacted to grid changes the way a power plant would – using more or less energy to balance the grid and keep the frequency near 60 hertz.Moreover, our system was designed to keep home temperatures within the same small temperature range around the set point.Testing the approachWe ran our system in four tests, each lasting one hour. We found two encouraging results.First, the air conditioners were able to provide frequency regulation at least as accurately as a traditional power plant. Therefore, we showed that air conditioners could play a significant role in increasing grid flexibility. But perhaps more importantly – at least in terms of encouraging people to participate in these types of systems – we found that we were able to do so without affecting people’s comfort in their homes.We found that home temperatures did not deviate more than 1.6 Fahrenheit from their set point. Homeowners were allowed to override the controls if they got uncomfortable, but most didn’t. For most tests, we received zero override requests. In the worst case, we received override requests from two of the 100 homes in our test.In practice, this sort of technology could be added to commercially available internet-connected thermostats. In exchange for credits on their energy bills, users could choose to join a service run by the thermostat company, their utility provider or some other third party.Then people could turn on the air conditioning in the summer heat without that pang of guilt, knowing they were helping to make the grid more reliable and more capable of accommodating renewable energy sources – without sacrificing their own comfort in the process.This article was originally published on The Conversation. Read the original article.

June 13, 20255 min readFive Climate Issues to Watch When Trump Goes to CanadaPresident Trump will attend the G7 summit on Sunday in a nation he threatened to annex. He will also be an outlier on climate issuesBy Sara Schonhardt & E&E News Saul Loeb/AFP via Getty ImagesCLIMATEWIRE | The world’s richest nations are gathering Sunday in the Canadian Rockies for a summit that could reveal whether President Donald Trump's policies are shaking global climate efforts.The Group of Seven meeting comes at a challenging time for international climate policy. Trump’s tariff seesaw has cast a shade over the global economy, and his domestic policies have threatened billions of dollars in funding for clean energy programs. Those pressures are colliding with record-breaking temperatures worldwide and explosive demand for energy, driven by power-hungry data centers linked to artificial intelligence technologies.On top of that, Trump has threatened to annex the host of the meeting — Canada — and members of his Cabinet have taken swipes at Europe’s use of renewable energy. Rather than being aligned with much of the world's assertion that fossil fuels should be tempered, Trump embraces the opposite position — drill for more oil and gas and keep burning coal, while repealing environmental regulations on the biggest sources of U.S. carbon pollution.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.Those moves illustrate his rejection of climate science and underscore his outlying positions on global warming in the G7.Here are five things to know about the summit.Who will be there?The group comprises Canada, France, Germany, Italy, Japan, the United Kingdom and the United States — plus the European Union. Together they account for more than 40 percent of gross domestic product globally and around a quarter of all energy-related carbon dioxide pollution, according to the International Energy Agency. The U.S. is the only one among them that is not trying to hit a carbon reduction goal.Some emerging economies have also been invited, including Mexico, India, South Africa and Brazil, the host of this year’s COP30 climate talks in November.Ahead of the meeting, the office of Canada's prime minister, Mark Carney, said he and Brazilian President Luiz Inácio Lula da Silva agreed to strengthen cooperation on energy security and critical minerals. White House press secretary Karoline Leavitt said Trump would be having "quite a few" bilateral meetings but that his schedule was in flux.The G7 first came together 50 years ago following the Arab oil embargo. Since then, its seven members have all joined the United Nations Framework Convention on Climate Change and the Paris Agreement. The U.S. is the only nation in the group that has withdrawn from the Paris Agreement, which counts almost every country in the world as a signatory.What’s on the table?Among Canada’s top priorities as host are strengthening energy security and fortifying critical mineral supply chains. Carney would also like to see some agreement on joint wildfire action.Expanding supply chains for critical minerals — and competing more aggressively with China over those resources — could be areas of common ground among the leaders. Climate change is expected to remain divisive. Looming over the discussions will be tariffs — which Trump has applied across the board — because they will have an impact on the clean energy transition.“I think probably the majority of the conversation will be less about climate per se, or certainly not using climate action as the frame, but more about energy transition and infrastructure as a way of kind of bridging the known gaps between most of the G7 and where the United States is right now,” said Dan Baer, director of the Europe program at the Carnegie Endowment for International Peace.What are the possible outcomes?The leaders could issue a communique at the end of their meeting, but those statements are based on consensus, something that would be difficult to reach without other G7 countries capitulating to Trump. Bloomberg reported Wednesday that nations won’t try to reach a joint agreement, in part because bridging gaps on climate change could be too hard.Instead, Carney could issue a chair’s summary or joint statements based on certain issues.The question is how far Canada will go to accommodate the U.S., which could try to roll back past statements on advancing clean energy, said Andrew Light, former assistant secretary of Energy for international affairs, who led ministerial-level negotiations for the G7.“They might say, rather than watering everything down that we accomplished in the last four years, we just do a chair's statement, which summarizes the debate,” Light said. “That will show you that you didn't get consensus, but you also didn't get capitulation.”What to watch forIf there is a communique, Light says he’ll be looking for whether there is tougher language on China and any signal of support for science and the Paris Agreement. During his first term, Trump refused to support the Paris accord in the G7 and G20 declarations.The statement could avoid climate and energy issues entirely. But if it backtracks on those issues, that could be a sign that countries made a deal by trading climate-related language for something else, Light said.Baer of Carnegie said a statement framed around energy security and infrastructure could be seen as a “pragmatic adaptation” to the U.S. administration, rather than an indication that other leaders aren’t concerned about climate change.Climate activists have lower expectations.“Realistically, we can expect very little, if any, mention of climate change,” said Caroline Brouillette, executive director of Climate Action Network Canada.“The message we should be expecting from those leaders is that climate action remains a priority for the rest of the G7 … whether it's on the transition away from fossil fuels and supporting developing countries through climate finance,” she said. “Especially now that the U.S. is stepping back, we need countries, including Canada, to be stepping up.”Best- and worst-case scenariosThe challenge for Carney will be preventing any further rupture with Trump, analysts said.In 2018, Trump made a hasty exit from the G7 summit, also in Canada that year, due largely to trade disagreements. He retracted his support for the joint statement.“The best, [most] realistic case outcome is that things don't get worse,” said Baer.The worst-case scenario? Some kind of “highly personalized spat” that could add to the sense of disorder, he added.“I think the G7 on the one hand has the potential to be more important than ever, as fewer and fewer platforms for international cooperation seem to be able to take action,” Baer said. “So it's both very important and also I don't have super-high expectations.”Reprinted from E&E News with permission from POLITICO, LLC. Copyright 2025. E&E News provides essential news for energy and environment professionals.

Nier: Automata creators deny characters "were problematic overseas" and blame mistranslated subtitle for censorship rumours Nier miss. Image credit: Square Enix News by Vikki Blake Contributor Published on June 14, 2025 Nier: Automata producer Yosuke Saito and director Yoko Taro have denied that any of their character designs were restricted for Western audiences. As spotted by Automaton, the developers were compelled to comment after a mistranslated Japanese-to-English subtitle intimated Nier: Automata had been subjected to censorship from Square Enix to meet global standards. GODDESS OF VICTORY: NIKKE | Producers' Creative Dialogue Special Livestream.Watch on YouTube In the interview above (skip to 28:12 for the segment concerned), Sony executive Yoshida Shuhei asked the developers about their design process. "Our concept is always to do something that's 'not like anything else'. What I mean is, if Nier: Replicant had a boy as the main character, Nier: Automata would have a girl protagonist. If Western sci-fi is filled with Marine-like soldiers, we might go in the opposite direction and use Gothic Lolita outfits, for example," Taro said. "We tend to take the contrarian route." "There are, of course, certain things that are ethically or morally inappropriate – even if they're just aspects of a character," Saito added, according to the subtitles. "We try to draw a line by establishing rules about what’s acceptable and what’s not. "While certain things might be acceptable in Japan, they could become problematic in certain overseas regions, and even characters could become problematic as well. These are the kind of situation[s] we usually try to avoid creating. As a result, there are actually countries where we couldn't officially release Nier: Automata." This immediately caused consternation with fans but as Automaton points out, this "could be a little tricky to translate, even for an advanced Japanese speaker". When asked directly about the claim, Taro denied it, saying on X/Twitter: "I've never heard of such a thing happening". Saito simply said he thought the things he'd mentioned had been mistranslated, and would clarify this in a future livestream. In the same interview, former PlayStation exec Shuhei Yoshida called Nier: Automata the "game that changed everything", as it was responsible for reviving the Japanese games industry on its release. In a recent interview, Yoshida discussed how during the PS3 era, sales of Japanese games had declined, and increasingly studios there were chasing "overseas tastes". That changed with NieR: Automata in 2017, released for the PS4. "I think Yoko Taro created it without paying any mind at all to making it sell overseas, but it was a tremendous success," Yoshida said.

June 13, 20253 min readCould Iran Have Been Close to Making a Nuclear Weapon? Uranium Enrichment ExplainedWhen Israeli aircraft recently struck a uranium-enrichment complex in the nation, Iran could have been days away from achieving “breakout,” the ability to quickly turn “yellowcake” uranium into bomb-grade fuel, with its new high-speed centrifugesBy Deni Ellis Béchard edited by Dean VisserMen work inside of a uranium conversion facility just outside the city of Isfahan, Iran, on March 30, 2005. The facility in Isfahan made hexaflouride gas, which was then enriched by feeding it into centrifuges at a facility in Natanz, Iran. Getty ImagesIn the predawn darkness on Friday local time, Israeli military aircraft struck one of Iran’s uranium-enrichment complexes near the city of Natanz. The warheads aimed to do more than shatter concrete; they were meant to buy time, according to news reports. For months, Iran had seemed to be edging ever closer to “breakout,” the point at which its growing stockpile of partially enriched uranium could be converted into fuel for a nuclear bomb. (Iran has denied that it has been pursuing nuclear weapons development.)But why did the strike occur now? One consideration could involve the way enrichment complexes work. Natural uranium is composed almost entirely of uranium 238, or U-238, an isotope that is relatively “heavy” (meaning it has more neutrons in its nucleus). Only about 0.7 percent is uranium 235 (U-235), a lighter isotope that is capable of sustaining a nuclear chain reaction. That means that in natural uranium, only seven atoms in 1,000 are the lighter, fission-ready U-235; “enrichment” simply means raising the percentage of U-235.U-235 can be used in warheads because its nucleus can easily be split. The International Atomic Energy Agency uses 25 kilograms of contained U-235 as the benchmark amount deemed sufficient for a first-generation implosion bomb. In such a weapon, the U-235 is surrounded by conventional explosives that, when detonated, compress the isotope. A separate device releases a neutron stream. (Neutrons are the neutral subatomic particle in an atom’s nucleus that adds to their mass.) Each time a neutron strikes a U-235 atom, the atom fissions; it divides and spits out, on average, two or three fresh neutrons—plus a burst of energy in the form of heat and gamma radiation. And the emitted neutrons in turn strike other U-235 nuclei, creating a self-sustaining chain reaction among the U-235 atoms that have been packed together into a critical mass. The result is a nuclear explosion. By contrast, the more common isotope, U-238, usually absorbs slow neutrons without splitting and cannot drive such a devastating chain reaction.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.To enrich uranium so that it contains enough U-235, the “yellowcake” uranium powder that comes out of a mine must go through a lengthy process of conversions to transform it from a solid into the gas uranium hexafluoride. First, a series of chemical processes refine the uranium and then, at high temperatures, each uranium atom is bound to six fluorine atoms. The result, uranium hexafluoride, is unusual: below 56 degrees Celsius (132.8 degrees Fahrenheit) it is a white, waxy solid, but just above that temperature, it sublimates into a dense, invisible gas.During enrichment, this uranium hexafluoride is loaded into a centrifuge: a metal cylinder that spins at tens of thousands of revolutions per minute—faster than the blades of a jet engine. As the heavier U-238 molecules drift toward the cylinder wall, the lighter U-235 molecules remain closer to the center and are siphoned off. This new, slightly U-235-richer gas is then put into the next centrifuge. The process is repeated 10 to 20 times as ever more enriched gas is sent through a series of centrifuges.Enrichment is a slow process, but the Iranian government has been working on this for years and already holds roughly 400 kilograms of uranium enriched to 60 percent U-235. This falls short of the 90 percent required for nuclear weapons. But whereas Iran’s first-generation IR-1 centrifuges whirl at about 63,000 revolutions per minute and do relatively modest work, its newer IR-6 models, built from high-strength carbon fiber, spin faster and produce enriched uranium far more quickly.Iran has been installing thousands of these units, especially at Fordow, an underground enrichment facility built beneath 80 to 90 meters of rock. According to a report released on Monday by the Institute for Science and International Security, the new centrifuges could produce enough 90 percent U-235 uranium for a warhead “in as little as two to three days” and enough for nine nuclear weapons in three weeks—or 19 by the end of the third month.