Although most Americans have eschewed seasonal COVID-19 vaccines, the updated shots continue to show significant protection against cardiovascular disease, especially for those over age 75 and those with underlying medical conditions. That's according to a new study that pulled data from more than 1 million patients in a US Department of Veterans Affairs (VA) health system.

The finding builds on previous data showing that the vaccines significantly lower the risk of COVID-19-associated cardiovascular risks, particularly heart attacks and strokes. But it wasn't a given that the benefit would hold up over time—as the virus evolved, the vaccines were updated, population-level immunity increased from previous infection and vaccination, and risk of severe outcomes fell.

The new study, published in JAMA Internal Medicine, found that the 2024–2025 COVID-19 vaccine continued to protect against COVID-19-associated "major adverse cardiovascular events" (MACE), which include cardiovascular death, heart attack, stroke, and hospitalization for heart failure.

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The UK government announced today that it will ban social media for all kids under the age of 16 in rules expected to take effect in spring 2027. The ban will apply to platforms including Snapchat, TikTok, YouTube, Instagram, Facebook, and X.

"We’re going further than any country in the world by banning social media for under-16s and putting wider protections in place to give kids their childhood back," Prime Minister Keir Starmer said in the announcement.

In addition to the ban on social media, Starmer's government said it will impose "world-leading blocks on harmful functions such as livestreaming and stranger communication with children for under-16s... Restrictions on these functionalities will also be on by default for 16- and 17-year-olds to prevent a cliff-edge at 16." The livestreaming and stranger-contact rules would apply to a range of services, such as online gaming.

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Chipmaker Nvidia is planning to sell $25 billion of investment-grade debt in the US on Monday, its first bond sale in five years, in a test of investor appetite for further exposure to the AI sector.

In a marquee seven-part bond offering, the company will issue a wide range of maturities from two years to 30 years, according to a term sheet seen by the FT.

The issuance was upsized from $20 billion after receiving more than $85 billion in orders by early afternoon in New York, according to people familiar with the deal.

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The upper stage from a commercial Chinese rocket that launched last week has broken apart in space, spreading debris in a heavily trafficked part of low-Earth orbit home to the International Space Station and a significant portion of SpaceX's Starlink broadband network.

The breakup occurred shortly after the Zhuque-2E rocket reached orbit on June 9 with two satellites providing direct-to-cell communications, perhaps around the time the upper stage was expected to perform a disposal burn. The US Space Force confirmed the breakup event in a post on space-track.org, a website used by the military to distribute orbit data to the public.

"The tracked pieces are being incorporated into routine conjunction assessment to support spaceflight safety," the Space Force wrote in an advisory. "There are currently no threats to human spaceflight. Analysis is ongoing."

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Fox Corporation has agreed to buy Roku Inc. for $160 per share, an approximate enterprise value of $22 billion, the firms announced today.

The acquisition would unite Fox’s broadcast channels, including Fox, Fox News, Fox Business, and FS1, as well as its streaming businesses, including Tubi, a free ad-supported streaming television (FAST) platform that Fox bought in 2020, with Roku’s own FAST service, The Roku Channel, and Roku’s streaming hardware business, including its streaming sticks and smart TVs. Roku says it has 100 million households using its platform.

The most valuable part of Roku’s business isn't its hardware, which lost $19.1 million in the quarter ending March 31, 2026, but its the operating system (Roku OS) and advertising business. In that same quarter, Roku’s advertising and subscriptions business posted a gross profit of $584.1 million, with the advertising business pulling in $371 million in revenue. The COVID-19 pandemic helped Roku become profitable in 2021, but the company didn’t see annual profitability again until 2025.

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A decade ago, AMD added a protection to its high-end CPUs to protect them against cold boot attacks and other types of physical exploits that siphon sensitive data out of the connected memory chips. Short for Transparent Secure Memory Encryption, TSME encrypts the entire contents stored in memory, making the data useless to physical attackers.

Over time, AMD added TSME to lower-end processors, including the consumer version of its Ryzen chips, a CPU that costs less than the Pro version. Over the years, users of these lower-end chips have gotten used to the added security. Recently and without warning or notice, this lower-end line of AMD chips suddenly dropped the protection, and did so in a way that was impossible to detect on Windows machines and required a fair amount of technical work when using Linux.

Now you see it, now you don't

AMD has yet to say why TSME worked on these CPUs, or even to confirm the change. AMD declined to answer questions sent by email other than to say TSME "is a security feature only applied to PRO CPUs as part of AMD PRO Technologies." The statement is the first known time the chipmaker has explicitly made this restriction public.

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The release of macOS 27 later this fall won't quite close the book on the Intel Mac. The last handful of models that could run macOS 26 Tahoe will be eligible for security and Safari updates for two more years, and elements of the Rosetta compatibility layer for running Intel code on Apple Silicon Macs will be with us in some form for some indeterminate amount of time after that.

But macOS 26 is definitely the last chapter of the Intel Mac story. Anything that happens after this is a coda or an epilogue.

Most of our WWDC coverage has been forward-looking, so indulge us if you will in a look backward at the full history of the Intel Mac, a partnership between two companies that made Macs dramatically better, until it started making them worse.

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It’s a bit worrying when a scientific paper begins, “How long will life on Earth survive?” But in this case—a study by Jacob Haqq‐Misra of Blue Marble Space and Eric Wolf at the University of Colorado Boulder—the billion-plus-year timeline under consideration shouldn’t cause you too much existential panic.

The context for this question is that we understand the Sun will brighten as it eventually matures into a red giant that swallows the Earth in a solar furnace. So, where along that 5 billion-year path will life on Earth, in fact, be cooked?

Weathering and the weather

This isn’t just a question of incoming radiation. Among the thermostat-like stabilizing feedback loops in Earth’s climate, the cycling of CO₂ through the solid Earth is a major factor over timescales this long. The weathering of silicate rocks at the surface converts atmospheric CO₂ into carbonate that ends up on the seafloor, where it can be subducted into the mantle with tectonic plates. (And eventually, it can cycle back out to the atmosphere through volcanoes.)

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Formula 1 raced in Spain this past weekend. The Barcelona-Catalunya circuit is one of F1's purpose-built race tracks, with a number of fast corners and a track surface that's more abrasive than usual. That means downforce is the name of the game. Catalunya has always required good aerodynamics, but it's doubly important now. The more speed you can carry through a corner, the less energy you have to add on the following straight, and energy management is now as important in F1 as it is at Le Mans or in Formula E or even IndyCar. And the more downforce you have, the less the car slides, and the less the car slides, the less the tires get eaten up.

It's the tire wear that suggested the strategies. So far, all the races this season have been one-stop affairs as drivers make their required change from one tire compound to another. But 66 laps of Catalunya would require at least three sets of Pirelli tires to get to the end. Maybe even four. As the tires wear, they become slower, to the tune of 0.2–0.3 seconds per lap. And one way to exploit that is with an "undercut"—pit early, change onto fresh rubber, and make use of the tire offset against your rivals to put in fast laps while they're losing time. Do it right, and when they make their next pit stop, you should be in front.

Splitting the race into four stints means one more pit stop, and it costs about 22 seconds to drive through the pit lane, stop in the box, and then exit the pit lane again, assuming a tire change in less than three seconds. But since each set of tires is needed for fewer laps, they can be worked hard enough to offset that 22-second pit stop and more.

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Ten days ago, in a moment of very high drama in orbit, NASA directed its astronauts living on the International Space Station to briefly seek emergency refuge in a Crew Dragon spacecraft.

Since then, neither the US space agency nor Roscosmos has provided additional public information about the situation in orbit. But according to sources who spoke to Ars, following the spectacle in space, the problem has been successfully fixed.

At issue were persistent cracks in a small area of the International Space Station attached to the Russian Zvezda service module, known as the PrK module. The problem has been ongoing since 2019, and Russian astronauts have been attempting various fixes, often using a sealant called Germetall-1.

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