New episodes of season 2 of The Last of Us are premiering on HBO every Sunday night, and Ars' Kyle Orland (who's played the games) and Andrew Cunningham (who hasn't) will be talking about them here every Monday morning . While these recaps don't delve into every single plot point of the episode, there are obviously heavy spoilers contained within, so go watch the episode first if you want to go in fresh.

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The Formula 1 race in Saudi Arabia last night was the fifth race in six weeks. The latest venue is a temporary street circuit of a breed with Las Vegas. It's a nighttime race set against a backdrop of bright-colored lights and sponsor-clad concrete walls lining the track. Except in Jeddah, many of the corners are blind, and most are very fast. As at Suzuka , qualifying was very important here, with just a few milliseconds making the difference.

Although it's far from the only autocratic petrostate on the F1 calendar, some people remain uncomfortable with F1 racing in Saudi Arabia, given that country's record of human rights abuses. I've not been, nor do I have any plans to attend a race there, but I had my eyes opened to a broader perspective by a couple of very thoughtful pieces written by motorsport journalist and sometime Ars contributor Hazel Southwell, who has attended several races in the kingdom, including as an independent journalist. Feel free to blast the sport in the comments, but do give Hazel's pieces a read .

Red Bull really doesn’t want next year’s engine rules

Despite a meeting last week that was meant to put the matter to bed, the ongoing saga of changes to next year's powertrain rules just won't go away. From 2026 until 2030, the new powertrains will use a V6 that provides 55 percent of the car's power and an electric hybrid motor that provides the other 45 percent. So that means an F1 car will only be able to make its full 1,000 hp (750 kW) if there's charge in the battery. If the pack is depleted or derates, the car will have just 536 hp (400 kW) from its V6 engine.

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Neuroscientists are striving to give a voice to people unable to speak in a fast-advancing quest to harness brainwaves to restore or enhance physical abilities.

Researchers at universities across California and companies, such as New York-based Precision Neuroscience, are among those making headway toward generating naturalistic speech through a combination of brain implants and artificial intelligence.

Investment and attention have long been focused on implants that enable severely disabled people to operate computer keyboards, control robotic arms, or regain some use of their own paralyzed limbs. But some labs are making strides by concentrating on technology that converts thought patterns into speech.

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Like giant bones planted in the earth, clusters of tree trunks, stripped clean of bark, are appearing along the Chesapeake Bay on the United States’ mid-Atlantic coast. They are ghost forests: the haunting remains of what were once stands of cedar and pine. Since the late 19th century, an ever-widening swath of these trees have died along the shore. And they won’t be growing back.

These arboreal graveyards are showing up in places where the land slopes gently into the ocean and where salty water increasingly encroaches. Along the United States’ East Coast, in pockets of the West Coast, and elsewhere, saltier soils have killed hundreds of thousands of acres of trees, leaving behind woody skeletons typically surrounded by marsh.

What happens next? That depends. As these dead forests transition, some will become marshes that maintain vital ecosystem services, such as buffering against storms and storing carbon. Others may become home to invasive plants or support no plant life at all—and the ecosystem services will be lost. Researchers are working to understand how this growing shift toward marshes and ghost forests will, on balance, affect coastal ecosystems.

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Whether anything ever lived on Mars is unknown. And the present environment, with harsh temperatures, intense radiation, and a sparse atmosphere, isn’t exactly propitious for life. Despite the red planet’s brutality, lichens that inhabit some of the harshest environments on Earth could possibly survive there.

Lichens are symbionts, or two organisms that are in a cooperative relationship. There is a fungal component (most are about 90 percent fungus) and a photosynthetic component (algae or cyanobacteria). To see if some species of lichen had what it takes to survive on Mars, a team of researchers led by botanist Kaja Skubała used the Space Research Center of the Polish Academy of Sciences to expose the lichen species Diploschistes muscorum and Cetrarea aculeata to simulate Mars conditions.

“Our study is the first to demonstrate that the metabolism of the fungal partner in lichen symbiosis was active while being in a Mars-like environment,” the researchers said in a study recently published in IMA Fungus. “X-rays associated with solar flares and SEPs reaching Mars should not affect the potential habitability of lichens on this planet.”

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Google's history with music services is almost as convoluted and frustrating as its history with messaging. However, things have gotten calmer ( and slower ) ever since Google ceded music to the YouTube division . The YouTube Music app has its share of annoyances, to be sure, but it's getting a long-overdue feature that users have been requesting for ages: consistent volume.

Listening to a single album from beginning to end is increasingly unusual in this age of unlimited access to music. As your playlist wheels from one genre or era to the next, the inevitable vibe shifts can be grating. Different tracks can have wildly different volumes, which can be shocking and potentially damaging to your ears if you've got your volume up for a ballad only to be hit with a heavy guitar riff after the break.

The gist of consistent volume simple—it normalizes volume across tracks, making the volume roughly the same. Consistent volume builds on a feature from the YouTube app called "stable volume." When Google released stable volume for YouTube, it noted that the feature would continuously adjust volume throughout the video. Because of that, it was disabled for music content on the platform.

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This week's flight of the New Shepard spacecraft, NS-31, and its all-female crew has stirred up a mess of coverage, from tabloids to high-brow journalism outlets. And why not? Six women, led by superstar Katy Perry, were flying into space!

By contrast, Ars Technica has been largely silent. Why? Because yet another suborbital flight on New Shepard matters little in the long arc of spaceflight history. Beyond that, I did not want to be too negative about someone else's happiness, especially since it was privately funded. Live and let live, and all of that.

However, if I'm being frank, this flight and its breathless promotion made me uncomfortable. Let me explain. Perhaps the most important change in spaceflight over the last two decades has been the rise of commercial spaceflight, which is bringing down the cost of access to space and marks an essential step to humanity becoming a spacefaring species. This rising tide has been spurred in large part by billionaires, particularly Elon Musk, Jeff Bezos, and, to a lesser extent, Richard Branson.

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When it comes to actually storing the numerical weights that power a large language model's underlying neural network , most modern AI models rely on the precision of 16- or 32-bit floating point numbers . But that level of precision can come at the cost of large memory footprints (in the hundreds of gigabytes for the largest models) and significant processing resources needed for the complex matrix multiplication used when responding to prompts.

Now, researchers at Microsoft's General Artificial Intelligence group have released a new neural network model that works with just three distinct weight values: -1, 0, or 1. Building on top of previous work Microsoft Research published in 2023 , the new model's "ternary" architecture reduces overall complexity and "substantial advantages in computational efficiency," the researchers write, allowing it to run effectively on a simple desktop CPU . And despite the massive reduction in weight precision, the researchers claim that the model "can achieve performance comparable to leading open-weight, full-precision models of similar size across a wide range of tasks."

Watching your weights

The idea of simplifying model weights isn't a completely new one in AI research. For years, researchers have been experimenting with quantization techniques that squeeze their neural network weights into smaller memory envelopes. In recent years, the most extreme quantization efforts have focused on so-called "BitNets" that represent each weight in a single bit (representing +1 or -1).

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Popular NAS-maker Synology has confirmed and slightly clarified a policy that appeared on its German website earlier this week: Its "Plus" tier of devices , starting with the 2025 series, will require Synology-branded hard drives for full compatibility, at least at first.

"Synology-branded drives will be needed for use in the newly announced Plus series, with plans to update the Product Compatibility List as additional drives can be thoroughly vetted in Synology systems," a Synology representative told Ars by email. "Extensive internal testing has shown that drives that follow a rigorous validation process when paired with Synology systems are at less risk of drive failure and ongoing compatibility issues."

Without a Synology-branded or approved drive in a device that requires it, NAS devices could fail to create storage pools and lose volume-wide deduplication and lifespan analysis, Synology's German press release stated . Similar drive restrictions are already in place for XS Plus and rack-mounted Synology models, though work-arounds exist.

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