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Stories from Sara Hashemi

Researchers studied ancient tooth fossils and found that a gene mutation in modern humans (right) better protected them against lead and gave them an advantage over Neanderthals (left). 

Our Human Ancestors Were Exposed to Lead, and New Research Suggests It May Have Shaped Human Evolution

Lead exposure may have spelled evolutionary success for humans—and extinction for our ancient cousins—but other scientists are casting doubt on the headline-making study

Coins left behind as offerings helped the researchers measure the size of the imprint from photos.

Chicago’s Famous ‘Rat Hole’ Wasn’t Actually Made by a Rat, According to a Statistical Analysis

Scientists are almost certain the viral imprint in a city sidewalk was actually made by an unlucky squirrel

SpaceX's Starship test flight launches from Texas.

SpaceX Successfully Launches Giant Starship Rocket’s 11th Test Flight

The company will soon begin testing the third version of its rocket

A gold mining operation in Peru

Study Finds High Levels of Mercury in Hair Samples From Indigenous Women in Peru and Nicaragua

Small-scale gold mining in the area releases mercury into the environment, where it can make its way into fish and, in turn, humans

The mold growing on batches of Bayley Hazen Blue cheese changed from green to white between 2016 and the present day.

Scientists Watch Fungi Evolve in Real Time, Thanks to a Marriage Proposal in a Cheese Cave

A new study pinpoints a disruption in a gene that made a beloved blue cheese’s rind go from green to white

The researchers found that tango is especially good at slowing brain aging. 

Creative Hobbies Like Tango Dancing or Playing Musical Instruments May Help Keep Your Brain Young, Study Finds

Scientists discovered that talented experts had “younger” brains than those of their less experienced counterparts, and even those who only dabbled in creativity reaped benefits

The European Space Agency’s ExoMars Trace Gas Orbiter captured images of 3I/ATLAS on October 3.

A Rare Interstellar Comet Just Flew by Mars—Here Are the Photos Captured by an Orbiting Spacecraft

The images offer the closest view yet of comet 3I/ATLAS, famous for being only the third known interstellar object to pass through our solar system

Comet C/2025 A6 (Lemmon) moves closer to the sun, as captured on October 2.

Here’s How to See Two Comets and a Meteor Shower Light Up the Sky This Month

Skywatchers are anticipating prime viewing conditions for an annual showing of shooting stars and two comet flybys

An egg with a human skin cell nucleus before fertilization

Scientists Made Functional Human Eggs With Skin Cells in ‘Proof of Concept’ for Advancing Fertility

The research could open up avenues for fertility treatments after additional refinement and trials, but it also raises ethical concerns

An illustration of the Wolf 1130ABC triple system, which is composed of a red dwarf star (left), a white dwarf (center) and the brown dwarf where phosphine was detected (right).

Scientists Finally Found Phosphine on a Brown Dwarf. Here’s What That Means for the Search for Extraterrestrial Life

The detection could force astronomers to reconsider their chemical models

Saturn’s E ring contains grains of water ice from the underground ocean on its moon Enceladus.

Decades-Old Data From Saturn’s Moon Enceladus Hints at Favorable Conditions for Life

The Cassini spacecraft flew by the small, icy moon in 2008, collecting information that suggests it shoots out molecules that could enable life

The researchers captured "microlightning" as they bubbled methane and air through water.

What Actually Sparks Will-o’-the-Wisps? A New Study Traces the Science Behind the Mysterious, Wandering Lights

The ghostly phenomenon could be the product of a chemical reaction involving methane, researchers suggest

Yunxian 1 (left) and Yunxian 2 (right) are skulls unearthed in China that had been badly crushed. Scientists digitally reconstructed Yunxian 2 (center) and analyzed its relationship to other early human fossils.

Scientists Reconstruct a Million-Year-Old Skull and Suggest It Could Rewrite Our Timeline of Human Evolution

A recent study dramatically pushes back the date for the emergence of our species, though some researchers call for further evidence

 Maria Branyas Morera on her 117th birthday

Scientists Studied the Genes of a Woman Who Lived 117 Years. Here’s What They Learned

Maria Branyas Morera, formerly the world’s oldest person, allowed researchers to take a detailed look at her biology before she died last year

The images, captured with the Event Horizon Telescope, show the magnetic field of the supermassive black hole M87* completely reversing.

Astronomers Watched a Black Hole Unexpectedly Flip Its Magnetic Field, Challenging Theoretical Models

A series of observations between 2017 and 2021 suggest the supermassive structure’s magnetized plasma is more dynamic than thought

Huntington's disease gradually damages the caudate nucleus, pictured in red. 

Experimental Gene Therapy Successfully Treats Huntington’s Disease for the First Time

Preliminary results from a small study offer hope for treatment of the degenerative disease

Stuttering affects roughly 1 percent of the world's population, yet it is not well researched.

What Causes Stuttering? A Large DNA Analysis Study Offers New Clues, Uncovering Links to 48 Genes

Scientists analyzed data from more than one million users of 23andMe and found associations between certain genes and stuttering

Scientists are considering what limits to potentially place on mirror-image cell research.

Scientists Weigh the Risks of ‘Mirror Life,’ Synthetic Molecules With a Reverse Version of Life’s Building Blocks

Though mirror biology might lead to improved drugs and other innovations, scientists have warned against potentially devastating consequences of this research

This event marks the first time the leopard shark (Stegostoma tigrinum) has been documented mating in the wild.

Rare Trio of Leopard Sharks Spotted Mating in the Wild for the First Time, and a Snorkeling Scientist Captured a Video

Conservationists say the unexpected observation could inform efforts to protect or reintroduce leopard sharks, an endangered species

A jaguar, not the one documented in the new study, swims in the Pantanal in Brazil.

A Jaguar in Brazil Makes the Longest Recorded Swim by the Species, Traversing at Least 0.79 Miles Through Water

The new record could help conservationists strategize ways to consider feline movements during construction of hydroelectric dams

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