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lundi 6 juillet 2026

Chemical accidents rise as Trump administration proposes weakening safety rules

Chemical accidents rise as Trump administration proposes weakening safety rules

Physicist Ronald Koopman appeared at a Southern California Air District meeting in 2018 to talk about what seemed like an arcane scientific topic: hydrofluoric acid dispersion and water mitigation testing.

Hydrofluoric acid, also known as hydrogen fluoride or HF, is used to manufacture a range of materials, including refrigerants, gasoline, fluorine-based pesticides and fluoropolymers like those used to make Teflon. It’s also one of the most corrosive and dangerous chemicals known. Koopman conducted experiments with the chemical in the 1980s that warned about the potential of deadly accidents at facilities that use the hazardous materials.

With the Trump administration poised to roll back rules intended to protect workers and communities from catastrophic industrial chemical releases, and a new analysis showing rising rates of chemical accidents, Koopman’s presentation on highly hazardous materials has taken on a new urgency.

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The missing 500 million: Cosmic bombardment melted Earth's first crust

The missing 500 million: Cosmic bombardment melted Earth's first crust

Earth is the only planet we know of with buoyant, silica-rich continents. But, despite decades of research, geologists still don't agree on how they formed. "The continents started appearing around about four billion years ago—that's the oldest continental rock we know about,” said Tim Johnson, a geologist at Curtin University in Perth, Australia. “The Earth is four and a half billion years old, so why they started appearing then is unknown, as is the mechanism to make that continental crust."

Johnson and his colleagues are now arguing that the formation of continents on Earth was caused largely by an intense, sustained barrage of asteroid impacts that kept the early crust hot and thin enough to make buoyant continents possible. In short, the lands we live on are here because of ancient bombardment from space.

Plates and plumes

The problem with studying the formation of continents is that the geological evidence of this process is almost gone. The oldest known continental-type rocks crystallized around 4.03 billion years ago, right at the end of the Hadean eon (the earliest era in Earth’s history, spanning the first 500 million years of its existence). Rare basaltic rocks date back about 4.2 billion years, and a handful of the oldest zircon crystals push the record back to 4.4 billion years. Beyond that, there's hardly anything else. So, scientists looking into the origin of continents had to rely largely on educated guesses. “There are huge debates about what was going on in the early Earth, because the data is so scarce,” Johnson said.

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Review: Supergirl is not the disaster its low box office suggests

Review: Supergirl is not the disaster its low box office suggests

Pour one out for Supergirl, the latest installment in the DCU's Gods and Monsters chapter, which has been beset by online troll attacks, mixed reviews, and a very disappointing opening weekend box office—not the outcome Warner Bros. was hoping for with this follow-up to last year's Superman. It's actually a pretty good movie, as such films go, but it's not a great movie. And in today's over-saturated superhero market, that's just not sufficient to get people out of their homes and into theaters, rather than waiting for the film to come to streaming platforms.

(Some spoilers below but no major reveals.)

The studio tapped Ana Nogueira to write the script, a holdover from the former DCEU plans for a standalone Supergirl film. (The character appeared in the finale of 2022's The Flash, played by Sasha Calle.) The project was reimagined when James Gunn and Peter Safran took over and launched the "soft reboot" DCU. Director Craig Gillespie (Lars and the Real Girl, I Tonya) signed on to direct.

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When the ability to smell goes away

When the ability to smell goes away

About 14 years ago, Chrissi Kelly lost her sense of smell. She had traveled to the Czech Republic to visit family and caught some virus. Months later, when she still couldn’t smell, she made the rounds to doctors, including her general practitioner and an ear, nose and throat specialist, trying to find answers.

She was diagnosed with anosmia (smell loss), and like many patients with her condition, was told she’d have to learn to live with it. But for her, the loss was catastrophic. “After about six months of complete loss, I was just climbing the walls, and I did not feel like myself anymore,” she says.

Researchers estimate that up to 22 percent of the population lives with smell impairments, like hyposmia (partial smell loss) or anosmia (complete smell loss). And many others live with smell disorders like phantosmia, in which a person picks up phantom smells, or parosmia, where typically pleasant scents like coffee or shampoo begin to register as highly unpleasant (think feces or vomit). Yet the conditions have been poorly understood, underdiagnosed and often minimized by clinicians.

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dimanche 5 juillet 2026

A martian rock has lots of carbon on it, and it's not clear why

A martian rock has lots of carbon on it, and it's not clear why

NASA’s Perseverance rover has spent five years traversing Jezero Crater looking for the chemical leftovers of whatever processes were at work on Mars billions of years ago. The rover has found organic carbon, but it has mostly been inside rocks that had to be drilled or abraded to expose it. But now, at an outcrop on the edge of an ancient river channel named Neretva Vallis, Perseverance detected complex macromolecular carbon sitting right on the rock’s surface.

“To our knowledge, that’s the shallowest detection of organic matter on Martian surface to date,” said Ashley E. Murphy, a researcher at the Planetary Institute in Tucson, Arizona, and lead author of the study of the rock, which was found at a site called Bright Angel. On Earth, this much macromolecular carbon usually suggests a biological origin. But to learn what this Bright Angel carbon is and where it came from, we might need to bring samples back to Earth.

Carbon on the rocks

The detection of Bright Angel carbon came from SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals), a UV Raman spectrometer fitted on Perseverance’s robotic arm. SHERLOC fires a deep-ultraviolet laser at a target and reads the light that bounces back at shifted energies, a signal that enables scientists to identify specific molecular bonds.

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Rocket Report: Indian startup nears first launch; SpaceX's millenary milestone

Rocket Report: Indian startup nears first launch; SpaceX's millenary milestone

Welcome to Edition 9.01 of the Rocket Report! Back in January, I wrote about the 20 launches and landings we were most excited about in 2026. The list included things that were, at the time, officially scheduled to occur this year. I also gave my own view of the probability of each of these events actually happening before December 31. Halfway through the year, we can only count one of the events as completed, and that was NASA's Artemis II mission in April. Many are now scheduled for next year, proving again that delays are a constant in the space industry. A couple of them—such as the launch of NASA's Roman Space Telescope—do appear to be on track to happen soon.

As always, we welcome reader submissions. If you don't want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets, as well as a quick look ahead at the next three launches on the calendar.

Swift Boost Mission reaches orbit. A pioneering commercial mission to reboost the orbit of NASA's Swift astronomy satellite launched early Friday after attempts earlier in the week were thwarted by bad weather and a technical issue. The Link servicing satellite developed by Katalyst Space Technologies soared to orbit on the tip of a Northrop Grumman Pegasus XL rocket that dropped from the belly of a modified L-1011 jetliner over the remote Pacific Ocean. Mission managers called off two launch attempts Tuesday and Wednesday due to poor weather around the L-1011's staging base on Kwajalein Atoll in the Marshall Islands. On Thursday, "a launch vehicle issue temporarily prevented teams from deploying the rocket" after takeoff of the L-1011.

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Inside the Luddite festival harnessing Gen Z’s rage against Big Tech

Inside the Luddite festival harnessing Gen Z’s rage against Big Tech

On a Sunday evening in the middle of Tompkins Square Park in New York City’s East Village, hundreds of people gather in front of a giant papier-mâché face of a woman wearing a crown. She’s the backdrop of a play, her body made up of curtains that look like a dress but serve a dual purpose, allowing actors to scurry on and offstage.

I’m here to watch a performance called “Luddite Recreations,” which is a history of the Luddite movement—a group of artisans and textile workers who resisted the adoption of machines during the early years of the Industrial Revolution in England and whose resistance to being displaced from their work was met with violence by the British monarchy.

It’s one of the opening events of the Summer of Ludd, a weeklong series of talks and activities like how to flirt and date offline, mending, and learning to fight against data centers, all focused on getting people off their phones and into community.

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