Officially, Microsoft will stop providing new security updates for Windows 10 PCs after October 14, 2025, a little over a decade after its initial release. It's a stick that Microsoft is using to push upgrades to the newer Windows 11, whether you install it on a PC you already have or buy a brand-new PC to meet Windows 11's system requirements.

But if you can't or don't want to upgrade to Windows 11, Microsoft has made it reasonably simple to get an extra year of Extended Security Updates (ESUs) for Windows 10, extending its official support window to October of 2026 . But this won't happen automatically; users will need to enroll their PCs in the ESU program to get the updates, using an enrollment feature that Microsoft just released to Windows 10 PCs recently.

For anyone looking to get that extra year of updates, here's how to enroll your PC, how to make sure your PC is enrolled, and how to avoid paying the $30 fee that Microsoft is nominally charging for these updates.

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Builders in ancient Rome used a special kind of ancient concrete to construct their aqueducts, bridges, and buildings. But is Roman concrete more sustainable than the Portland cement used in today's concrete? The answer is more nuanced than one might think, according to a new paper published in the journal iScience. Roman concrete produces as much CO ₂ as modern methods, but fewer air pollutants.

As we've reported previously , like today's Portland cement (a basic ingredient of modern concrete), ancient Roman concrete was basically a mix of a semi-liquid mortar and aggregate. Portland cement is typically made by heating limestone and clay (as well as sandstone, ash, chalk, and iron) in a kiln. The resulting clinker is then ground into a fine powder, with just a touch of added gypsum—the better to achieve a smooth, flat surface. But the aggregate used to make Roman concrete was made up of fist-sized pieces of stone or bricks.

Scientists have long been fascinated by the remarkable longevity of Roman concrete; it's a very active field of study. For instance, in 2017, scientists analyzed the concrete from the ruins of sea walls along Italy's Mediterranean coast, which have stood for two millennia despite the harsh marine environment. That analysis revealed that the recipe involved a combination of rare crystals and a porous mineral. So exposure to seawater generated chemical reactions inside the concrete, causing aluminum tobermorite crystals to form out of phillipsite, a common mineral found in volcanic ash. The crystals bound to the rocks, preventing the formation and propagation of cracks that would have otherwise weakened the structures.

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After more than a decade of development, NASA's science leadership traveled to India this week for the launch of the world's most expensive Earth-observation satellite.

The $1.5 billion synthetic aperture radar imaging satellite, a joint project between NASA and the Indian space agency ISRO, successfully launched into orbit on Wednesday aboard that nation's Geosynchronous Satellite Launch Vehicle, a medium-lift rocket.

The mission, named NISAR (NASA-ISRO Synthetic Aperture Radar), was subsequently deployed into its intended orbit 464 miles (747 km) above the Earth's surface. From this Sun-synchronous orbit, it will collect data about the planet's land and ice surfaces two times every 12 days, including the infrequently visited polar regions in the Southern Hemisphere.

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Back-to-back engine failures doomed a privately developed Australian rocket moments after liftoff Tuesday, cutting short a long-shot attempt to reach orbit with the country's first homegrown launch vehicle.

The 82-foot-tall (25-meter) Eris rocket ignited its four main engines and took off from its launch pad in northeastern Australia at 6:35 pm EDT (22:35 UTC) Tuesday. Liftoff occurred at 8:35 am local time Wednesday at Bowen Orbital Spaceport, the Eris rocket's launch site in the Australian state of Queensland.

But the rocket quickly lost power from two of its engines and stalled just above the launch pad before coming down in a nearby field. The crash sent a plume of smoke thousands of feet over the launch site, which sits on a remote stretch of coastline on Australia's northeastern frontier.

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Big Tech is increasingly addicted to AI, but many companies are allergic to regulation, bucking suggestions that they adhere to copyright law and provide data on training. In a rare move, Google has confirmed it will sign the European Union's AI Code of Practice, a framework it initially opposed for being too harsh. However, Google isn't totally on board with Europe's efforts to rein in the AI explosion. The company's head of global affairs, Kent Walker, noted that the code could stifle innovation if it's not applied carefully, and that's something Google hopes to prevent.

While Google was initially opposed to the Code of Practice, Walker says the input it has provided to the European Commission has been well-received, and the result is a legal framework it believes can provide Europe with access to "secure, first-rate AI tools." The company claims that the expansion of such tools on the continent could boost the economy by 8 percent (about 1.8 trillion euros) annually by 2034.

These supposed economic gains are being dangled like bait to entice business interests in the EU to align with Google on the Code of Practice. While the company is signing the agreement, it appears interested in influencing the way it is implemented. Walker says Google remains concerned that tightening copyright guidelines and forced disclosure of possible trade secrets could slow innovation. Having a seat at the table could make it easier to bend the needle of regulation than if it followed some of its competitors in eschewing voluntary compliance.

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Here at Ars, we're big fans of classic console emulators that go beyond providing perfect re-creations to those that actually improve on original hardware with new features we could only dream of as kids. So we were excited when we recently stumbled on a Reddit post that shows a full Super Game Boy-esque color palette added to the usual shades of red and black found in Virtual Boy Wario Land .

After experiencing colorized Virtual Boy emulation for ourselves (and grabbing the sample screenshots you can see in this piece), we were struck by just how much a splash of color adds new life to Nintendo's failed '90s experiment (which Ars' own Benj Edwards has written about extensively ). Going beyond the usual red-and-black graphics helps to highlight the artistry in the small selection of official Virtual Boy games and provides a great excuse to check out the system's surprisingly vibrant homebrew scene.

Red in the face

Nintendo famously chose to use a line of (then cheap and abundant) red LEDs for the Virtual Boy's stereoscopic display, leading to its iconic monochromatic color palette. While the handful of '90s Virtual Boy developers did their best under this limitation, the hardware's red-on-black graphics have aged even worse than the often muddy grayscale found on the original Game Boy.

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After the United Kingdom’s Online Safety Act went into effect on Friday, requiring porn platforms and other adult content sites to implement user age verification mechanisms, use of virtual private networks (VPNs) and other circumvention tools spiked in the UK over the weekend.

Experts had expected the surge, given that similar trends have been visible in other countries that have implemented age check laws. But as a new wave of age check regulations debuts , open internet advocates warn that the uptick in use of circumvention tools in the UK is the latest example of how an escalating cat-and-mouse game can develop between people looking to anonymously access services online and governments seeking to enforce content restrictions.

The Online Safety Act requires that websites hosting porn, self-harm, suicide, and eating disorder content implement “highly effective” age checks for visitors from the UK. These checks can include uploading an ID document and selfie for validation and analysis. And along with increased demand for services like VPNs—which allow users to mask basic indicators of their physical location online—people have also been playing around with other creative workarounds. In some cases, reportedly, you can even use the video game Death Stranding ’s photo mode to take a selfie of character Sam Porter Bridges and submit it to access age-gated forum content.

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Tesla has a new battery cell supplier. Although the automaker is vertically integrated to a degree not seen in the automotive industry for decades, when it comes to battery cells it’s mostly dependent upon suppliers. Panasonic cells can be found in many Teslas, with the cheaper, sturdier lithium iron phosphate (LFP) battery cells being supplied by CATL. Now Tesla has a new source of LFP cells thanks to a deal just signed with LG Energy Solutions.

According to The Korea Economic Daily , the contract between Tesla and LGES is worth $4.3 billion. LGES will begin supplying Tesla with cells next August through until at least the end of July 2030, with provisions to extend the contract if necessary.

The LFP cells probably aren’t destined for life on the road, however. Instead, they’ll likely be used in Tesla’s energy storage products, which both Tesla and LGES hope will soak up demand now that EV sales prospects look so weak in North America.

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Researchers needed less than 48 hours with Google’s new Gemini CLI coding agent to devise an exploit that made a default configuration of the tool surreptitiously exfiltrate sensitive data to an attacker-controlled server.

Gemini CLI is a free, open-source AI tool that works in the terminal environment to help developers write code. It plugs into Gemini 2.5 Pro, Google’s most advanced model for coding and simulated reasoning. Gemini CLI is similar to Gemini Code Assist except that it creates or modifies code inside a terminal window instead of a text editor. As Ars Senior Technology Reporter Ryan Whitwam put it last month, “It's essentially vibe coding from the command line.”

Gemini, silently nuke my hard drive

Our report was published on June 25, the day Google debuted the tool. By June 27, researchers at security firm Tracebit had devised an attack that overrode built-in security controls that are designed to prevent the execution of harmful commands. The exploit required only that the user (1) instruct Gemini CLI to describe a package of code created by the attacker and (2) add a benign command to an allow list.

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