Despite claims of environmental leadership and promises to preserve the Amazon rainforest ahead of COP30, Brazil is stripping away protections for the region’s vital ecosystems faster than workers dismantled the tents that housed the recent global climate summit in Belém.

On Nov. 27, less than a week after COP30 ended, a powerful political bloc in Brazil’s National Congress, representing agribusiness, and development interests, weakened safeguards for the Amazon’s rivers, forests, and Indigenous communities.

The rollback centered on provisions in an environmental licensing bill passed by the government a few months before COP30. The law began to take shape well before, during the Jair Bolsonaro presidency from 2019 to 2023. It reflected the deregulatory agenda of the rural caucus, the Frente Parlamentar da Agropecuária , which wielded significant power during his term and remains influential today.

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Back in 2023, we reported on MIT scientists’ conclusion that the ancient Romans employed “hot mixing” with quicklime, among other strategies, to make their famous concrete, giving the material self-healing functionality. The only snag was that this didn’t match the recipe as described in historical texts. Now the same team is back with a fresh analysis of samples collected from a recently discovered site that confirms the Romans did indeed use hot mixing, according to a new paper published in the journal Nature Communications.

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 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.

In his treatise De architectura (circa 30 CE), the Roman architect and engineer Vitruvius wrote about how to build concrete walls for funerary structures that could endure for a long time without falling into ruin. He recommended the walls be at least two feet thick, made of either “squared red stone or of brick or lava laid in courses.” The brick or volcanic rock aggregate should be bound with mortar composed of hydrated lime and porous fragments of glass and crystals from volcanic eruptions (known as volcanic tephra).

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Sending astronauts to the red planet will be a decades-long activity and cost many billions of dollars. So why should NASA undertake such a bold mission?

A new report published Tuesday , titled “A Science Strategy for the Human Exploration of Mars,” represents the answer from leading scientists and engineers in the United States: finding whether life exists, or once did, beyond Earth.

“We’re searching for life on Mars,” said Dava Newman, a professor in the Department of Aeronautics and Astronautics at Massachusetts Institute of Technology and co-chair of the committee that wrote the report, in an interview with Ars. “The answer to the question ‘are we alone ‘ is always going to be ‘maybe,’ unless it becomes yes.”

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Near the end of the film A House of Dynamite , a fictional American president portrayed by Idris Elba sums up the theory of nuclear deterrence.

“Just being ready is the point, right?” Elba says. “It keeps people in check. Keeps the world straight. If they see how prepared we are, no one starts a nuclear war.”

There’s a lot that goes wrong in the film, namely the collapse of deterrence itself. For more than 60 years, the US military has used its vast arsenal of nuclear weapons, constantly deployed on Navy submarines, at Air Force bomber bases, and in Minuteman missile fields, as a way of saying don’t mess with us. In the event of a first strike against the United States, an adversary would be assured of an overwhelming nuclear response, giving rise to the concept of Mutual Assured Destruction.

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Nearly a decade after Pebble’s nascent smartwatch empire crumbled, the brand is staging a comeback with new wearables. The Pebble Core Duo 2 and Core Time 2 are a natural evolution of the company’s low-power smartwatch designs, but its next wearable is something different. The Index 01 is a ring, but you probably shouldn’t call it a smart ring. The Index does just one thing—capture voice notes—but the firm says it does that one thing extremely well.

Most of today’s smart rings offer users the ability to track health stats, along with various minor smartphone integrations. With all the sensors and data collection, these devices can cost as much as a smartwatch and require frequent charging. The Index 01 doesn’t do any of that. It contains a Bluetooth radio, a microphone, a hearing aid battery, and a physical button. You press the button, record your note, and that’s it. The company says the Index 01 will run for years on a charge and will cost just $75 during the preorder period. After that, it will go up to $99.

Core Devices, the new home of Pebble, says the Index is designed to be worn on your index finger (get it?), where you can easily mash the device’s button with your thumb. Unlike recording notes with a phone or smartwatch, you don’t need both hands to create voice notes with the Index.

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In a lawsuit filed against top Trump administration officials on Monday, Apple was accused of caving to unconstitutional government demands by removing an Immigration and Customs Enforcement -spotting app from the App Store with more than a million users.

In his complaint, Joshua Aaron, creator of ICEBlock, cited a Fox News interview in which Attorney General Pam Bondi “made plain that the United States government used its regulatory power to coerce a private platform to suppress First Amendment-protected expression.”

Suing Bondi—along with Department of Homeland Security Secretary Kristi Noem, Acting Director of ICE Todd Lyons, White House “Border Czar” Thomas D. Homan, and unnamed others—Aaron further alleged that US officials made false statements and “unlawful threats” to criminally investigate and prosecute him for developing ICEBlock.

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Netflix won the bidding war for Warner Bros. Discovery’s (WBD’s) streaming and movie studio businesses last week. But Paramount Skydance isn’t relenting on its dreams of owning WBD and is pushing forward with a hostile takeover bid.

On Friday, Netflix announced that it had agreed to pay an equity value of $72 billion, or an approximate total enterprise value of $82.7 billion, for WBD’s streaming and film businesses, as well as its film and TV libraries. The deal includes HBO and the HBO Max streaming service but not WBD’s cable channels, which are to be split off ahead of the acquisition into a separate company called Discovery Global. Netflix said WBD’s split should conclude in Q3 2026.

Paramount has different plans, though.

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The 2025 Formula 1 World Championship drew to a close this past weekend in Abu Dhabi, and with it came the end of the current generation of cars. After a grueling 24 races, the title was decided in a three-way fight by the finest of margins; just two points, less than half a percent, separated the winning driver from second place when the checkered flag waved on Sunday.

Coming into Abu Dhabi, McLaren’s Lando Norris was, if not a comfortable favorite, then at least the driver with the highest odds of prevailing. After a strong start to the season, the British driver’s form dipped at the Dutch Grand Prix. But he bounced back, retaking the championship lead from his Australian teammate Oscar Piastri in Mexico in October.

For much of the season, it seemed to be a two-car race. McLaren had a clear car advantage and two strong drivers, suggesting a repeat of the years we saw Lewis Hamilton and Nico Rosberg duking it out to bring home titles for Mercedes. But that didn’t figure on Red Bull developing its car late in the season. New boss Laurent Mekies has revitalized the energy drinks squad, and four-time champion Max Verstappen was able to close inexorably toward the McLaren drivers in the points with a string of sublime performances .

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Almost every bit of bike testing I’ve done starts out the same way. After assembling the bike, I set the seatpost to its maximum possible height, take it on a short test ride, and try to figure out new and creative phrasing to describe the same old problem: The frame isn’t quite big enough to accommodate my legs. While I’m on the tall side at a bit over six feet (~190 cm), I’m definitely not abnormally large. Yet very few e-bike manufacturers seem to be interested in giving people my height a comfortable ride.

So imagine my surprise when, within two blocks of my first ride on the XPress 750, I had to pull off to the side of the street and lower the seat. This was especially notable given that the XPress is a budget bike (currently on sale for just under $1,000.00) that is only offered in a single frame size. So kudos to Lectric for giving me a comfortable and enjoyable ride, and doing so with a lot of features I wouldn’t expect at this price point.

That said, hitting that price necessitated some significant compromises. We’ll discuss those in detail so you can get a sense of whether any of them will get in the way of your riding enjoyment.

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