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  • Death toll from Texas floods reaches 78; Trump plans visit

    Death toll from Texas floods reaches 78; Trump plans visit

    First responders survey rising flood waters of the Guadalupe River after flash flooding in Kerr County, Texas, US July 4, 2025 in a still image from video. — Reuters
    • 10 girls and a counsellor missing at a summer camp.
    • Search for survivors continues amid fears of more flooding.
    • President to visit site amid questions over federal response cuts.

    The death toll from catastrophic floods in Texas reached at least 78 on Sunday, including at least 28 children, as the search for girls missing from a summer camp entered a third day, and fears of more flash flooding as rain fell on saturated ground prompted fresh evacuations.

    Larry Leitha, the Kerr County Sheriff in Texas Hill Country, said 68 people had died in flooding in his county, the epicentre of the flooding, among them 28 children. 

    Texas Governor Greg Abbott, speaking at a press conference on Sunday afternoon, said another 10 had died elsewhere in Texas and 41 were confirmed missing. The governor did not say how many of the dead outside Kerr were children.

    Among the most devastating impacts of the flooding occurred at Camp Mystic summer camp, a nearly century-old Christian girls’ camp. Sheriff Leitha said on Sunday that 10 Camp Mystic campers and one counsellor were still missing.

    “It was nothing short of horrific to see what those young children went through,” said Abbott, who said he toured the area on Saturday and pledged to continue efforts to locate the missing.

    The flooding occurred after the nearby Guadalupe River broke its banks after torrential rain fell in the central Texas area on Friday, the US Independence Day holiday.

    Texas Division of Emergency Management Chief Nim Kidd said at the press conference on Sunday afternoon that the destruction killed three people in Burnet County, one in Tom Green County, five in Travis County and one in Williamson County.

    “You will see the death toll rise today and tomorrow,” said Freeman Martin, director of the Texas Department of Public Safety, also speaking on Sunday.

    A vehicle rides through a flooded road, following flash flooding, in Hunt, Texas, US July 6, 2025. — Reuters
    A vehicle rides through a flooded road, following flash flooding, in Hunt, Texas, US July 6, 2025. — Reuters

    Officials said on Saturday that more than 850 people had been rescued, including some clinging to trees, after a sudden storm dumped up to 15 inches (38cm) of rain across the region, about 85 miles (140km) northwest of San Antonio.

    “Everyone in the community is hurting,” Leitha told reporters.

    A wall of water

    Kidd said he was receiving unconfirmed reports of “an additional wall of water” flowing down some of the creeks in the Guadalupe Rivershed, as rain continued to fall on soil in the region already saturated from Friday’s rains.

    He said aircraft were sent aloft to scout for additional floodwaters, while search-and-rescue personnel who might be in harm’s way were alerted to pull back from the river in the meantime.

    The National Weather Service issued flood warnings and advisories for central Texas that were to last until 4:15pm local time (2115 GMT) as rains fell, potentially complicating rescue efforts.

    The Federal Emergency Management Agency was activated on Sunday and is deploying resources to first responders in Texas after President Donald Trump issued a major disaster declaration, the Department of Homeland Security said in a statement.

    US Coast Guard helicopters and planes are helping the search and rescue efforts, the department said.

    Scaling back federal disaster response

    Trump, who said on Sunday he would visit the disaster scene, probably on Friday, has previously outlined plans to scale back the federal government’s role in responding to natural disasters, leaving states to shoulder more of the burden themselves.

    Some experts questioned whether cuts to the federal workforce by the Trump administration, including to the agency that oversees the National Weather Service, led to a failure by officials to accurately predict the severity of the floods and issue appropriate warnings ahead of the storm.

    Trump’s administration has overseen thousands of job cuts from the National Weather Service’s parent agency, the National Oceanic and Atmospheric Administration, leaving many weather offices understaffed, former NOAA director Rick Spinrad said.

    Spinrad said he did not know if those staff cuts factored into the lack of warning for the extreme Texas flooding, but that they would inevitably degrade the agency’s ability to deliver accurate and timely forecasts.

    Homeland Security Secretary Kristi Noem, who oversees NOAA, said a “moderate” flood watch issued on Thursday by the National Weather Service had not accurately predicted the extreme rainfall and said the Trump administration was working to upgrade the system.

    Joaquin Castro, a Democratic US congressman from Texas, told CNN’s “State of the Union” program that fewer personnel at the weather service could be dangerous.

    “When you have flash flooding, there’s a risk that if you don’t have the personnel … to do that analysis, do the predictions in the best way, it could lead to tragedy,” Castro said.

    ‘Complete devastation’

    Camp Mystic had 700 girls in residence at the time of the flooding.

    Katharine Somerville, a counsellor on the Cypress Lake side of Camp Mystic, on higher ground than the Guadalupe River side, said her 13-year-old campers were scared as their cabins sustained damage and lost power in the middle of the night.

    “Our cabins at the tippity top of hills were completely flooded with water. I mean, y’all have seen the complete devastation, we never even imagined that this could happen,” Somerville said in an interview on Fox News on Sunday.

    Somerville said the campers in her care were put on military trucks and evacuated, and that all were safe.

    The disaster unfolded rapidly on Friday morning as heavier-than-forecast rain drove river waters rapidly to as high as 29 feet (9 meters).

    A day after the disaster struck, the summer camp was a scene of devastation. Inside one cabin, mud lines indicating how high the water had risen were at least six feet (1.83 m) from the floor. Bed frames, mattresses and personal belongings caked with mud were scattered inside. Some buildings had broken windows, one had a missing wall.


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  • exoatlas: Friendly Python Code For Exoplanet Populations

    exoatlas: Friendly Python Code For Exoplanet Populations

    Example exoatlas visualization placing the first discovered transiting exoplanet HD209458b in context with other transiting exoplanets and the eight major Solar System planets. Errorbars use a color intensity that scales inversely with quantity uncertainties, to avoid giving undue visual weight to the least precise data. — astro-ph.IM

    Planets are complicated. Understanding how they work requires connecting individual objects to the context of broader populations.

    Exoplanets are easier to picture next to their closest Solar System archetypes, and planets in the Solar System are richer when seen alongside a growing community of known exoplanets in the Milky Way.

    The exoatlas toolkit provides a friendly Python interface for retrieving and working with populations of planets, aiming to simplify the process of placing worlds in context.

    Zach K. Berta-Thompson, Patcharapol Wachiraphan, Autumn Stephens, Mirielle Caradonna, Catriona Murray, Valerie Arriero, Jackson Avery, Girish M. Duvvuri, Sebastian Pineda

    Comments: Submitted to the Journal of Open Source Software. Please try it at this link https://zkbt.github.io/exoatlas/ and submit GitHub Issues with bugs or suggestions for improvement!
    Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
    Cite as: arXiv:2507.02210 [astro-ph.IM] (or arXiv:2507.02210v1 [astro-ph.IM] for this version)
    https://doi.org/10.48550/arXiv.2507.02210
    Focus to learn more
    Submission history
    From: Zach K. Berta-Thompson
    [v1] Thu, 3 Jul 2025 00:14:38 UTC (250 KB)
    https://arxiv.org/abs/2507.02210
    Astrobiology

    Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

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  • TikTok building new version of app ahead of expected US sale, The Information reports – Reuters

    1. TikTok building new version of app ahead of expected US sale, The Information reports  Reuters
    2. TikTok building new version of app ahead of expected US sale: report  Dawn
    3. Trump says US will start talks with China on TikTok deal this week  Reuters
    4. Trump says he has group of ‘very wealthy people’ ready to buy TikTok  CNBC
    5. TikTok Building New Version of App Ahead of Expected U.S. Sale  The Information

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  • Diversity of Rocky Planet Atmospheres In The C-H-O-N-S-Cl System With Interior Dissolution, Non-ideality, and Condensation: Application to TRAPPIST-1e and Sub-Neptunes

    Diversity of Rocky Planet Atmospheres In The C-H-O-N-S-Cl System With Interior Dissolution, Non-ideality, and Condensation: Application to TRAPPIST-1e and Sub-Neptunes

    Atmospheric speciation of TRAPPIST-1e at 280 K above a planetary surface with stable condensates for atmospheres originally in equilibrium with a fully molten mantle. In all panels, the curve colours correspond to the gas species listed in the legend and condensate masses are relative to Earth oceans (EO). Upper panels show the percentage of models by dominant species (VMR > 50%) that satisfy the requirement of a minimum mass of (a) Water, (b) Graphite, (c) α-sulfur, and (d) Ammonium chloride. Lower panels illustrate the composition and total pressure of the atmosphere for (e) CO2-rich above a water ocean, (f) CH4-rich above graphite, (g) CO2-rich above α-sulfur, and (h) CH4-rich above ammonium chloride. Median values are indicated by lines and shaded regions bracket the first and third quartiles. Compare to the atmospheric speciation derived from a partially molten mantle in Figure A5. — astro-ph.EP

    A quantitative understanding of the nature and composition of low-mass rocky exo(planet) atmospheres during their evolution is needed to interpret observations.

    The magma ocean stage of terrestrial- and sub-Neptune planets permits mass exchange between their interiors and atmospheres, during which the mass and speciation of the atmosphere is dictated by the planet’s volatile budget, chemical equilibria, and gas/fluid solubility in molten rock.

    As the atmosphere cools, it is modified by gas-phase reactions and condensation. We combine these processes into an open-source Python package built using JAX called Atmodeller, and perform calculations for planet sizes and conditions analogous to TRAPPIST-1e and K2-18b.

    For TRAPPIST-1e-like planets, our simulations indicate that CO-dominated atmospheres are prevalent during the magma ocean stage, which, upon isochemical cooling, predominantly evolve into CO2-rich atmospheres of a few hundred bar at 280 K. Around 40% of our simulations predict the coexistence of liquid water, graphite, sulfur, and ammonium chloride-key ingredients for surface habitability.

    For sub-Neptune gas dwarfs, pressures are sufficiently high (few GPa) to deviate the fugacities of gases from ideality, thereby drastically enhancing their solubilities. This buffers the total atmospheric pressure to lower values than for the ideal case. These effects conspire to produce CH4-rich sub-Neptune atmospheres for total pressures exceeding around 3.5 GPa, provided H/C is approximately 100x solar and fO2 moderately reducing (3 log10 units below the iron-wüstite buffer).

    Otherwise, molecular hydrogen remains the predominant species at lower total pressures and/or higher H/C. For all planets at high temperature, solubility enriches C/H in the atmosphere relative to the initial composition.

    Dan J. Bower, Maggie A. Thompson, Kaustubh Hakim, Meng Tian, Paolo A. Sossi

    Comments: 41 pages, 10 figures in main text, 8 figures in appendices, submitted to ApJ
    Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
    Cite as: arXiv:2507.00499 [astro-ph.EP] (or arXiv:2507.00499v1 [astro-ph.EP] for this version)
    https://doi.org/10.48550/arXiv.2507.00499
    Focus to learn more
    Submission history
    From: Dan Bower
    [v1] Tue, 1 Jul 2025 07:14:10 UTC (12,751 KB)
    https://arxiv.org/abs/2507.00499
    Astrobiology

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  • René Rast finishes twice in the top ten – Marco Wittmann unlucky at his home event.

    René Rast finishes twice in the top ten – Marco Wittmann unlucky at his home event.

    Nürnberg.

    René Rast (GER) managed to limit the damage for Schubert
    Motorsport during an overall disappointing DTM race weekend at the
    Norisring (GER). Thanks to strong fighting performances in both
    races, he secured valuable championship points with tenth and
    seventh-place finishes. Marco Wittmann (GER) endured a frustrating
    home event. After finishing 18th on Saturday, he was forced to
    retire on Sunday in the very first lap due to an unavoidable
    accident. Meanwhile, there was reason to celebrate in ADAC GT4 Germany.

     

    On the tight street circuit in Nürnberg, Rast and Wittmann lacked the
    tools to secure top qualifying positions. However, Rast made
    significant progress in both races, climbing from 17th and 11th on the
    grid to finish 10th and 7th, respectively. On Sunday, he was as low as
    14th at the time of the restart following Wittmann’s crash but managed
    to move up significantly thanks to strong performances by both himself
    and the team. Rast remains within striking distance of the
    championship lead, sitting on 90 points, just 19 points behind the
    leader. Schubert Motorsport is third in the team standings with 155
    points. For Marco Wittmann, his home event was a frustrating
    experience. On Saturday, he lacked the pace to move forward from his
    starting position, finishing 18th. On Sunday, his race ended in the
    very first corner when he was squeezed by several competitors and
    pushed into the wall, leaving him with no chance to continue.

     

    ADAC GT4 Germany: Double podium for
    Besler/Piana.
    The ADAC GT4 Germany races were much more
    successful for BMW M Motorsport teams. BMW M Racing Academy member
    Berkay Besler (TUR) and Gabriele Piana (ITA) delivered standout
    performances in the #21 BMW M4 GT4 EVO from FK Performance Motorsport.
    The duo, fresh from their first win of the season in the GT4 European
    Series a week earlier, continued their strong form with second-place
    finishes in both races at the Norisring. On Saturday, three BMW M4 GT4
    EVOs finished in the top ten, and on Sunday, four cars achieved the
    same feat. Among them was the car of BMW M Racing Academy member Niels
    Tröger (GER), who, alongside Andreas Jochimsen (DEN), finished sixth
    and eighth.

     

    Statements after the race weekend:

     

    Björn Lellmann (Head of Customer Racing at BMW M
    Motorsport): 
    “We are all disappointed after this very mixed
    weekend, especially because the Norisring is such an important event
    for our partner Schaeffler. I feel very sorry for Marco Wittmann and
    his fans that his race ended so early on Sunday. What René Rast
    achieved on Sunday, moving from 14th at the restart to finish 7th, was
    impressive. Unfortunately, we couldn’t position our cars at the front
    in qualifying, which makes it very difficult to move forward on such a
    short track. On the other hand, ADAC GT4 Germany went very well. I’m
    delighted with the two podium finishes for FK Performance Motorsport
    and drivers Berkay Besler and Gabriele Piana. Both Berkay and Niels
    Tröger, our BMW M Racing Academy members, delivered strong
    performances at the Norisring.”

     

    Torsten Schubert (Team Principal Schubert Motorsport):
    “These were tough races for us. It was clear that other
    manufacturers were significantly faster than us at the Norisring. On
    Sunday, we managed to move René forward with a good strategy and
    strong pit stops, extracting the maximum. It’s a real shame for Marco
    that he was pushed into the wall through no fault of his own in the
    very first corner of his home race on Sunday. We are now fully focused
    on being more competitive at the Nürburgring. We’ll also be there with
    the ADAC GT Masters before the DTM and hope to gain valuable insights.”

     

    René Rast (#33 RoboMarkets BMW M4 GT3 EVO, R1: 10th place, R2:
    7th place):
    “It was a tough weekend for us. We didn’t have
    the speed we needed to compete at the front. Thanks to the team’s
    great work, I was able to make up many positions in both races and
    extract nearly the maximum. We’ll take the points and haven’t lost too
    much ground in the standings. It was damage limitation. Now we’ll
    focus on doing better next time.”

     

    Marco Wittmann (#11 Schaeffler BMW M4 GT3 EVO, R1: 18th place,
    R2: DNF):
    “A very disappointing weekend for me. We
    struggled from the start and never had the pace to aim for a top ten
    or top five result. Then, to be pushed into the wall in the first
    corner of my home race on Sunday is disheartening. There was nothing I
    could do in that situation. The only positive was the fantastic fans,
    who once again made the Norisring event unique.”

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  • This Dell 15″ Laptop (i5, 1TB PCIe SSD, 32GB RAM) Is 75% Off, Amazon Is Going Nuts for Prime Day

    This Dell 15″ Laptop (i5, 1TB PCIe SSD, 32GB RAM) Is 75% Off, Amazon Is Going Nuts for Prime Day

    There is no better time to shop for laptops on Amazon than Prime Day. As the biggest shopping event of the year for the retailer, Prime Day is when Amazon slashes prices on everything – even going as far as selling best-selling items at a loss.

    This year, the Dell 15-inch 3530 laptop (Intel 10-Core i5-1334U, 1TB PCIe SSD, 32GB DDR4 RAM) is the best example of just how low these prices can go: You can pick up this beast of a machine right now for only $649, a whopping 73% off its regular price of $2,399. That’s a discount of $1,750, and it makes this the best deal of all the Prime Day laptop sales. Even better, you don’t have to be a Prime member to snag this deal.

    See at Amazon

    Perfect Laptop For Day Use

    You’ll enjoy a 13th generation Intel Core i5-1334U processor which features 10 cores that (unexpectedly) outperform the i7-1250U in the majority of tasks. That means snappy and responsive performance when you’re multitasking or running demanding programs. Paired with a spacious 32GB of DDR4 RAM, this Dell laptop can handle demanding workloads and have multiple applications open in the background without slowing down.

    It also comes with a massive 1TB PCIe SSD which gives you instant boot-up times, quick file transfers and plenty of space for all of your files. The SSD also helps to keep the laptop quiet and power-efficient with less heat and noise than traditional hard drives. The 15-inch full HD screen provides a clear image with a 120Hz refresh rate, and everything from spreadsheets to streamed video appears smooth.

    With WiFi and Bluetooth built-in, it’s easy to get online and connect your favorite wireless peripherals. The laptop has a number of ports including HDMI and USB Type-C (with an adapter), so you can hook up external monitors, storage, and more. The integrated Intel Iris Xe graphics are more than capable of handling daily visual tasks. You also get a built-in webcam.

    This Dell 15 3530 laptop comes with Windows 11 Pro, and offers a secure and modern operating system that’s ready to work or play straight out of the box. The non-backlit keyboard has a 10-key numeric keypad and it is ideal for anyone who works with numbers or prefers a full keyboard layout. Weighing in at only 2,200 grams (approximately 4.85 pounds) and under an inch in depth, it’s light enough to carry wherever life takes you.

    With Prime Day deals like this, stock is sure to move fast so don’t wait too long to grab yours before this offer disappears.

    See at Amazon

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  • Jonathan Bailey lauds Scarlet Johansson’s joyful energy on set

    Jonathan Bailey lauds Scarlet Johansson’s joyful energy on set



    Jonathan Bailey lauds Scarlet Johansson’s joyful energy on set

    Jonathan Bailey praised his co-star Scarlet Johansson for maintaining a positive energy on the set of Jurassic World Reborn.

    Bailey and Johansson played Dr Henry Loomis and Zora Bennett in the film, which followed them as they embark on a mission to harvest dinosaur DNA for life-saving drug development.

    In an interview with the People Magazine, the Wicked star said about The Avengers alum, “[Johansson’s] super funny, intelligent, kind. She led the film with such incredible energy, and that’s on and off camera.”

    Apart from Bailey’s acknowledgement, their other co-stars Gracia-Rulfo described Johansson as the group leader and organiser for dinners and off-day trips.

    In an interview with Variety he said, ” Johansson is unaware of who she is. I tell her, ‘You know you’re Scarlett Johansson?’ She goes in the world like, ‘La, la, la,’ and that’s so beautiful.”

    Previously in an interview Johansson talked about how her came dream came true through this movie, adding, “I think as a huge fan, I’m just excited for ‘Jurassic’ nerds to see it because I think they’ll like it a lot.”

    “And I hope that there are other 10-year-olds that have the same experience that I did when I saw the first ‘Jurassic’ in theaters, where they can just be completely carried away for two hours. It makes you dream,” she said.

    The Jurassic World Reborn is now running in theatres.

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  • Formation of Complex Organic Molecules in Prestellar Cores: The Role of Non-Diffusive Grain Chemistry

    Formation of Complex Organic Molecules in Prestellar Cores: The Role of Non-Diffusive Grain Chemistry

    The major COMs formation routes on grain surface. The COMs studied in our simulations have teal background. The species involved in the methanol formation chain are highlighted in bold. The chemical desorption in the COMs surface formation reactions is the main source of the gaseous COMs. The expressions +H and +H/−H2 together denote a pair of reactions, H-atom addition and H-atom abstraction. — astro-ph.GA

    We present the results of astrochemical modeling of complex organic molecules (COMs) in the ice and gas of the prestellar core L1544 with the recently updated MONACO rate equations-based model.

    The model includes, in particular, non-diffusive processes, new laboratory verified chemical routes for acetaldehyde and methane ice formation and variation of H and H2 desorption energies depending on the surface coverage by H2 molecules.

    For the first time, we simultaneously reproduce the abundances of several oxygen-bearing COMs in the gas phase, the approximate location of the peak of methanol emission, as well as the abundance of methanol in the icy mantles of L1544.

    Radical-radical reactions on grains surface between species such as CH3, CH3O and HCO efficiently proceed non-diffusively. COMs are delivered to the gas phase via chemical desorption amplified by the loops of H-addition/abstraction surface reactions.

    However, gas-phase chemical reactions as well provide a noticeable input to the formation of COMs in the gas, but not to the COMs solid-state abundances. This particularly applies for CH3CHO and CH3OCH3. The simulated abundances of COMs in the ice are in the range 1%–2% (for methyl formate ice) or ∼~0.1% (for CH3CHO and CH3OCH3) with respect to the abundance of H2O ice.

    We stress a similarity between the simulated abundances of icy COMs in L1544 and the abundances of COMs in the gas phase of hot cores/corinos. We compare our non-diffusive model with the diffusive model and provide constraints for the species’ diffusion-to-desorption energy ratios.

    Katerina Borshcheva (1 and 2), Gleb Fedoseev (3, 4 and 1), Anna F. Punanova (5), Paola Caselli (6), Izaskun Jiménez-Serra (7), Anton I. Vasyunin (1) ((1) Research Laboratory for Astrochemistry, Ural Federal University, Yekaterinburg, Russia (2) Institute of Astronomy of the Russian Academy of Sciences, Moscow, Russia (3) Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, China (4) Xinjiang Key Laboratory of Radio Astrophysics, Urumqi, China (5) Onsala Space Observatory, Råö, Onsala, Sweden (6) Max-Planck-Institute for Extraterrestrial Physics, Garching, Germany (7) Centro de Astrobiologia (CSIC-INTA), Torrejon de Ardoz Madrid, Spain)

    Comments: 34 pages, 13 figures, 10 tables, accepted to The Astrophysical Journal
    Subjects: Astrophysics of Galaxies (astro-ph.GA)
    Cite as: arXiv:2507.00338 [astro-ph.GA] (or arXiv:2507.00338v1 [astro-ph.GA] for this version)
    https://doi.org/10.48550/arXiv.2507.00338
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    Submission history
    From: Anton Vasyunin
    [v1] Tue, 1 Jul 2025 00:35:09 UTC (629 KB)
    https://arxiv.org/abs/2507.00338
    Astrobiology

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  • How Earth’s Biomass Changed Over 500 Million Years

    How Earth’s Biomass Changed Over 500 Million Years

    Reef scene off the coast of St. Croix, USVI [Photo credit: NOAA CCMA Biogeography Branch]

    In a first-of-its-kind study, Stanford researchers have measured how the abundance of ocean life has changed over the past half-billion years of Earth’s history.

    Overall, the total mass of marine organisms has generally increased over the past 500 million years, the study showed, albeit with setbacks after major extinction events. The findings align with evidence for a similar rise in marine biodiversity – the total variety of organisms – over the past half-eon from studies dating as far back as the 19th century, suggesting an evolutionary connection between biomass and biodiversity. The research appears in Current Biology June 25.

    “Understanding the amount of biomass is important because it represents key traits about an ecosystem that are not captured by the number of species or even the number of niches that they fill,” said study lead author Pulkit Singh, a postdoctoral scholar in Earth and Planetary Sciences in the Stanford Doerr School of Sustainability. “But as we move into the past, our measurements of biomass are very limited, so that was the big gap in biological history we wanted to fill with our study.”

    The results come from an in-depth compilation and review of data from thousands of rock samples containing skeletal remains, which in the oceanic environment primarily comprise shells of animals, certain kinds of algae, and single-celled organisms called protists. Fossils with skeletal remains recorded the amount of biomass – the material comprising and produced by living things – that was preserved across different geological intervals. Biomass reveals the productivity of an ecosystem, indicating the amount of energy (food) present and the quantity of organisms that a system can support. Productivity, in turn, speaks to ecosystem health, and in the broad aggregate, to planetary health.

    Researchers have long shied away from attempting to measure biomass, given the immense effort required to gather relevant data and the possibility that data wouldn’t be sufficient for revealing meaningful patterns. Singh undertook the challenge, devoting several years to compiling data published over decades, as well as adding new data from his own samples.

    “The first quantitative effort to document and graph biodiversity across geological time was made in 1860, but until Pulkit’s paper, there’s never been a corresponding biomass-across-time paper,” said senior study author Jonathan Payne, the Dorrell William Kirby Professor of Earth and Planetary Sciences at Stanford. “I’m impressed by his intellectual courage to go and take a chance on a project like this.”

    Picking through the past

    For the study, Singh and colleagues considered more than 7,700 marine limestone samples from all over the world spanning the past 540 million years that have been documented across more than 100 scientific studies. The research team relied on data gathered via a standard method known as petrographic point-counting to assess the percentage of each sample that contained skeletal remains. The time-consuming technique involves cutting and polishing rocks very thinly so light can shine through them, then examining the thin sections of rock samples under a microscope to quantify their composition.

    During the Cambrian, the earliest period sampled that started about 540 million years ago, researchers found fewer than 10 percent of the rocks, on average, were composed of shell material. As the Cambrian gave way to the Ordovician Period about 485 million years ago, that percentage climbed, partly reflecting the “Cambrian Explosion,” when life on Earth dramatically expanded in diversity and complexity. Calcifying sponges were initially notable contributors to biomass but were later leapfrogged by newly evolved echinoderms – including ancestors of modern-day starfish – and marine arthropods, including extinct trilobites and ancestors of crabs.

    Throughout much of the next 230 million years, shell content soared well above 20 percent, with a significant decrease during one of the “Big Five” mass extinction events in the Late Devonian, about 375 to 360 million years ago. The biggest drop in living history then struck about 250 million years ago during the “Great Dying,” the Permian-Triassic extinction, when shell percentage plummeted to about 3 percent.

    Life recovered, and except for subsequent significant mass extinctions – the end-Triassic extinction about 200 million years ago and the Cretaceous-Paleogene about 66 million years ago, which infamously killed off the non-avian dinosaurs – biomass has boomed in our current geological era, the Cenozoic, with shells exceeding 40 percent of rock volume, thanks in part to substantial contributions from mollusks and corals. “The overall pattern that we were able to capture is that it’s a gradual increase,” Singh said.

    One of the biggest challenges in conducting the study involved telling whether the increasing shell content in rocks truly signaled a rise in bio-abundances over time or if other ecological factors, such as a decrease in shell-boring and -destroying predators, or methodological sample biases were behind the pattern.

    To cross-check their results, the researchers performed a series of rigorous tests. They sorted samples by depositional environment of shallow or deep water, factoring in how shell remains accumulate more frequently in better-populated shallow waters. The researchers also sorted samples by different latitudes and locations and shapes of the predecessors of today’s continents. Through it all, the signal remained strongly consistent across water depths, latitudes, and geologic settings.

    “The more tests we did and the more we divided our dataset, we realized that these big biological patterns we were seeing stayed over time,” Singh said.

    Life-altering events

    As to why marine life has generally increased, evidence points to the parallel trends in greater diversity. With marine organisms becoming more specialized and more variable in their specializations, more energy can be extracted from available nutrients and food resources. This enhanced nutrient recycling starts with the autotrophs, such as phytoplankton, that photosynthetically “feed” on sunlight and ends with decomposers returning nutrients to the environment that autotrophs take up.

    “The overall idea is that there is more food available in ecosystems and because of that, the ecosystems can support more life, there’s more energy available, and that leads to greater abundance expressed in biomass,” Singh said.

    Whether or not the plenitude seen over the last hundreds of millions of years will persist could be in question, considering impacts from human activities. Although people have caused fertilizer runoff, overfishing, ocean acidification, and more during a mere blip in geological time, scientists have widely documented an ongoing, human-driven sixth mass extinction. Accumulating losses in biodiversity could potentially reduce biomass, and vice versa – a signal that perhaps could be captured in the fossil record currently being laid down.

    “From our study’s perspective, modern times are quite complicated given the extent of human activity that’s rapidly altering conditions planetwide, including in the oceans,” said Payne, who is also a senior fellow at the Stanford Woods Institute for the Environment. “But our findings show that overall biomass is linked to biodiversity and that losses in biodiversity may suppress productivity for geologically meaningful intervals, adding one more argument of why conserving biodiversity is essential for the health of humans and our planet.”

    Additional Stanford co-authors include Jordan Ferré, Bridget Thrasher, and Pedro Monarrez. Other study co-authors are from the Virginia Polytechnic Institute and State University, King Fahd University of Petroleum and Minerals, Cantrell GeoLogic LLC, Trinity University, and the University of Ferrara. The research was supported by a Frontier Research in Earth Sciences grant from the U.S. National Science Foundation.

    Macroevolutionary coupling of marine biomass and biodiversity across the Phanerozoic, Current Biology

    Astrobiology,

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  • HF‑11 Hypercar Revs to 12,000 RPM and Swaps Between Gas and Electric

    HF‑11 Hypercar Revs to 12,000 RPM and Swaps Between Gas and Electric

    HF‑11 Hypercar Revs to 12,000 RPM and Swaps Between Gas and Electric originally appeared on Autoblog.

    In a world dominated by hybrid hypercars built by billion-dollar conglomerates, the Oil Stain Lab HF‑11 is a welcome oddity. It’s the creation of two Ukrainian-American brothers, Nikita and Iliya Bridan — ex-Honda, Cadillac and Genesis designers — who decided the only way to scratch their creative itch was to build a 12,000 rpm, dual-drivetrain, 2,000-pound hypercar out of sheer obsession.

    Only 25 will be made. Each one costs at least $1.85 million, or $2.3 million if you want both powertrains.

    View the 3 images of this gallery on the original article

    Twin Madness: Flat‑Six Or EV, Or Both

    The HF‑11 is about choice. Buyers can spec a 4.6-liter naturally aspirated flat-six making 600 hp, or step up to the unhinged 5.0-liter twin-turbo flat-six good for a staggering 1,200 hp — all mounted in the middle of a carbon monocoque and sending power to the rear wheels. Both are available with a six-speed manual or a seven-speed sequential box. That alone would be enough for most small-volume hypercars.

    But this isn’t most hypercars.

    Oil Stain Lab is also building a fully electric version with around 850 hp, and here’s the twist: thanks to a modular subframe system, owners can swap between the ICE and EV powertrains. That’s right — one car, two wildly different personalities, depending on the day, track, or mood.

    12,000 RPM And 2,000 lbs

    Despite the turbocharged flat-six having “just” six cylinders, it’s designed to scream all the way to 12,000 rpm. When combined with the car’s 910 kg weight, the HF‑11 promises a power-to-weight ratio that puts it well ahead of the Bugatti Chiron and toe-to-toe with the Gordon Murray T.50.

    Performance claims remain vague — understandable for a car still in development — but 0–60mph in the low 3s seems conservative. Top speed? Unofficially, well beyond 200mph.

    View the 4 images of this gallery on the original article

    Inside The Machine

    Step into the HF-11 and you’ll find a cockpit that looks like it was designed by a watchmaker having a nervous breakdown inside an F1 wind tunnel. The entire cabin is draped in carbon weave, from the exposed monocoque to the sculpted centre console — not just for weight savings, but sheer visual drama. There’s no touchscreen, no voice assistant, and certainly no cupholders. What you get instead is a bank of heavy-duty toggle switches, rotary dials, and knurled metal knobs straight out of a Cold War fighter jet.

    The shifter itself is a skeletal work of art: part titanium sculpture, part ballistic missile trigger. Above it, the triple-pod analogue dash recalls classic Porsche GT racers, but everything else feels raw, functional, and unapologetically mechanical. Even the starter switch appears to be mounted inside a billet aluminium pod held together with titanium struts. It’s less interior, more exoskeleton.

    There’s suede where you need it and structure where you don’t. The HF-11 doesn’t try to coddle you. It tries to connect you — to the drivetrain, to the chassis, and to the road. If you want ambient lighting and a Spotify playlist, look elsewhere. This thing was built to be felt, not filtered.

    A Real Car, Built By Real People

    The HF‑11’s styling feels familiar but alien. It riffs on classic Porsche silhouettes — there are shades of Carrera GT, 962, even 917 — but everything is dialed up to 11. Giant rear diffusers, razor-edge front wings, and track-ready aero components all scream performance. Yet, inside, it’s raw, stripped-back, and mechanical. Think Group C meets bespoke hot rod.

    What makes the HF‑11 more than a concept car with delusions of grandeur is the pedigree behind it. The Bridan twins were involved in cars that sold in the millions, but they’re chasing purity now. Their mission: build the “ultimate human-scale hypercar,” one with minimal electronics, obsessive focus, and mechanical soul.

    They already made waves with the viral Half-11, a chopped-up Porsche homage that earned cult status. The HF‑11 is its spiritual evolution — faster, crazier, and far more complete.

    This isn’t just an ambitious spec sheet. It’s two engineers turning decades of experience and design frustration into an unfiltered, track-ready love letter to speed. And whether it sells out or implodes spectacularly, it deserves to be noticed.

    HF‑11 Hypercar Revs to 12,000 RPM and Swaps Between Gas and Electric first appeared on Autoblog on Jul 6, 2025

    This story was originally reported by Autoblog on Jul 6, 2025, where it first appeared.

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