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Science Daily·Saturday, December 20, 2025

Science Daily - Saturday, December 20, 2025

10 stories~15 min

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Stories Covered

01

What scientists found inside Titan was not what anyone expected

For years, scientists thought Saturn’s moon Titan hid a global ocean beneath its frozen surface. A new look at Cassini data now suggests something very different: a thick, slushy interior with pockets of liquid water rather than an open sea. A subtle delay in how Titan deforms under Saturn’s gravity revealed this stickier structure. These slushy environments could still be promising places to search for life.

02

This “mushroom” is not a fungus, it’s a bizarre plant that breaks all the rules

Balanophora is a plant that abandoned photosynthesis long ago and now lives entirely as a parasite on tree roots, hidden in dark forest undergrowth. Scientists surveying rare populations across East Asian islands uncovered how its cellular machinery shrank but didn’t disappear, revealing unexpected similarities to parasites like malaria. Some island species even reproduce without sex, cloning themselves to colonize new habitats. This strange survival strategy comes with risks, leaving the plant

03

Deaths of despair were rising long before opioids

Long before opioids flooded communities, something else was quietly changing—and it may have helped set the stage for today’s crisis. A new study finds that as church attendance dropped among middle-aged, less educated white Americans, deaths from overdoses, suicide, and alcohol-related disease began to rise. The trend started years before OxyContin appeared, suggesting the opioid epidemic intensified a problem already underway.

04

The 98% mystery: Scientists just cracked the code on “junk DNA” linked to Alzheimer’s

Researchers have revealed that so-called “junk DNA” contains powerful switches that help control brain cells linked to Alzheimer’s disease. By experimentally testing nearly 1,000 DNA switches in human astrocytes, scientists identified around 150 that truly influence gene activity—many tied to known Alzheimer’s risk genes. The findings help explain why many disease-linked genetic changes sit outside genes themselves. The resulting dataset is now being used to train AI systems to predict gene cont

05

NASA just caught a rare glimpse of an interstellar comet

An instrument aboard NASA’s Europa Clipper spacecraft captured rare ultraviolet observations of an interstellar comet while Earth-based telescopes were blinded by the Sun. The spacecraft’s unique position provided an unprecedented look at the comet’s dust and plasma tails from an unusual angle. Scientists detected hydrogen, oxygen, and signs of intense gas release, hinting at powerful activity after the comet’s closest approach to the Sun. The findings may reveal clues about how comets form arou

06

The real reason incomes rise and why they drop

Getting ahead financially is mainly about what you earn at work, not what you make from investments. Researchers found that promotions, skills, and better jobs drive most upward income movement. But when people slip backward, falling investment income is usually the main reason. Labor builds income steadily; capital is riskier and more unpredictable.

07

An 11-year-old needed two new organs and doctors made history

In a rare and historic achievement, Children’s Hospital Colorado successfully completed its first dual heart and liver transplant in a pediatric patient. The life-saving surgery was performed on 11-year-old Gracie Greenlaw, whose congenital heart condition eventually led to liver failure. Dozens of specialists worked together for years to prepare for a moment like this, executing a complex, 16-hour operation. Now months later, Gracie is home, in school, and thriving.

08

Neurons aren’t supposed to regrow but these ones brought back vision

After injury, the visual system can recover by growing new neural connections rather than replacing lost cells. Researchers found that surviving eye cells formed extra branches that restored communication with the brain. These new pathways worked much like the originals. The repair process, however, was slower or incomplete in females, pointing to important biological differences in recovery.

10

The gear meant to protect firefighters may carry hidden dangers

Firefighter turnout gear is designed to shield first responders from extreme heat and danger, but new research suggests it may also introduce chemical exposures. A U.S. study found that brominated flame retardants are present across multiple layers of firefighter gear, including newer equipment marketed as PFAS-free. In some cases, these chemicals appeared at higher levels than the substances they were meant to replace.

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