
01
Trump repeals emissions regulations of fossil-fuel power plants
The gist: The EPA is moving to remove rules requiring fossil-fuel power plants to capture 90 percent of their greenhouse gas emissions, a decision critics say will worsen climate change and harm public health.
Big picturePower plants are the largest stationary source of greenhouse gas emissions in the United States, producing more than 1.4 billion metric tons in 2023. Removing their limits could increase pollution and make it harder for future administrations to regulate emissions without new action from Congress.
Explain like I'm 5Some power plants make gases that act like a blanket around Earth and trap heat. The government had told them to catch most of those gases, but it now wants to remove that requirement.
Why it matters nowThe Trump administration’s EPA announced the move after proposing it more than a year ago as part of a broader deregulation effort. Environmental groups say they will challenge the decision in court.
Three things to know01The rule targeted major polluters
The regulations covered coal- and natural gas-fired plants, which together remained responsible for more than 1.4 billion metric tons of carbon dioxide and other greenhouse gases in 2023.
02The savings are disputed
The EPA says removing the rules will save $310 billion, while the Biden-era EPA and climate scientists said cutting pollution would avoid tens of billions of dollars in public-health costs.
03Court fights are likely
The Natural Resources Defense Council argues the rollback violates the Clean Air Act and Supreme Court precedent, setting up a legal challenge over the agency’s authority.
Trusted source
Scientific American ↗
%2Fhttps%3A%2F%2Ftf-cmsv2-smithsonianmag-media.s3.amazonaws.com%2Ffiler_public%2F3a%2F70%2F3a7012b6-f877-41a0-a0ee-fc2251c68db7%2Fsmithsonian_feature_images_17.png&w=1064&h=710&fit=cover)
02
Scientists Find a Trove of Denisovan Fossils and Tools in Southwest China, Giving an Unprecedented Glimpse Into Our Extinct Cousins' Lives
The gist: A cave in southwestern China has yielded seven Denisovan fossils and more than 1,300 tools, revealing how these extinct human relatives lived.
Big pictureDenisovan fossils are much rarer than Neanderthal remains, so this discovery fills a major gap in scientists’ understanding of them. It also extends the group’s known range and shows they hunted large animals and used the cave repeatedly.
Explain like I'm 5Denisovans were ancient human cousins that disappeared long ago. This cave is like a time capsule, holding pieces of their bodies, tools, and meals.
Why it matters nowTwo studies published September 9 describe the fossils, tools, and animal remains from Bianfu Cave. Researchers now have new evidence about Denisovan anatomy and behavior, even though the fossils yielded no DNA.
Three things to know01Protein analysis identified fragments
Researchers sorted more than 60,000 bone fragments by shape, then used preserved proteins to identify Denisovan remains because DNA had broken down.
02The fossils represent four individuals
The find includes two skull fragments, four teeth, and part of a forearm bone from at least four Denisovans who lived there between 134,000 and 167,000 years ago.
03Their prey required skilled hunting
Cut marks and break patterns on deer and water-buffalo bones suggest the cave’s occupants processed large prey, while the tools were simpler and likely made quickly for flexible use.
Trusted source
Smithsonian ↗

03
Cancer is rising in younger adults. Faster biological aging may help explain why
The gist: A study found that younger generations show signs of faster biological aging, which is linked to a higher risk of cancer before age 55.
Big pictureThe findings suggest that many influences, including health, behavior and the modern environment, may combine to affect cancer risk rather than one cause explaining the trend. Biological-age measures could eventually help doctors identify higher-risk people and tailor prevention or screening.
Explain like I'm 5Your body has a calendar age, but its cells can look younger or older than that calendar says. Researchers found that some younger people’s bodies seem to be aging faster, possibly making cancer more likely.
Why it matters nowThe findings were published in Nature Medicine, while researchers continue studying what is driving faster biological aging and how it might guide earlier prevention.
Three things to know01Researchers used large datasets
The study analyzed health and biological information from more than 154,000 UK Biobank participants and over 10,000 people in the U.S. All of Us program.
02Aging differs across organs
An older-appearing immune system was associated with early-onset lung cancer, while older-appearing fat tissue was associated with early-onset colorectal cancer.
03Biological age uses body clues
Researchers estimated aging with blood chemicals, metabolism patterns and proteins linked to particular organs, rather than simply counting a person's years.
Trusted source
ScienceDaily ↗