Evolution

A 236-million-year-old fossil challenges the story of mammalian live birth

Some cynodonts may have been giving birth to live young much sooner in evolutionary history than previously assumed. A new Frontiers in Mammal Science study has offered the first compelling evidence that cynodonts may have ...

Space Exploration

Satellite constellations could create spiraling space debris

To date, close to 30,000 satellites have been launched into Earth's orbit, leading to mounting concerns over the debris created when they collide. In a new analysis posted to the preprint server arXiv, Hugh Lewis of the University ...

Taking the stairs could cut risk of early death

Taking the stairs could help you live longer—according to new research from the University of East Anglia and the Norfolk and Norwich University Hospital. The study, published today, suggests that climbing stairs significantly ...

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Consumer & Gadgets
Should people marry AI agents?

Credit ratings can shape corporate financial decisions

On the surface, credit rating agencies simply score a company's financial health. They look at a business's equity and debt and diagnose how risky it is for investors. They slap on a letter grade to show how likely it is ...

What if there's a star inside a black hole?

There is a question that often comes up at every public talk I do, and I have never had a good answer to it—well, not an entirely confident one. What's inside a black hole? The textbook reply is a singularity. Cross the event ...

As urban tree shade shrinks, mortality rises

As trees disappear from urban neighborhoods, lives may be lost with them. In a new study, Northwestern University scientists tracked death rates and fluctuations in tree canopy cover across an 11-year period in Chicago. They ...

Severe COVID-19 reactivates dormant viruses, study finds

Chronically infecting viruses—such as Epstein-Barr virus, cytomegalovirus (CMV) and herpesviruses—are common and often innocuous and asymptomatic. However, emerging evidence suggests their reactivation may contribute to autoimmune ...

Nanowires restore key functions in aging T cells

For decades, scientists have accepted that the immune system naturally weakens with age. Georgia Tech biomedical engineer and Carl Ring Family Professor Ankur Singh wasn't convinced. Then the COVID-19 pandemic made the stakes ...

Little-known protein helps the body restrain scar-forming signals

U.K. and U.S. scientists have uncovered an important piece of the puzzle in the signaling pathway that causes damaging scar tissue to build up in the body, raising hopes for future treatments. A team from the University of ...

Experimental drug turns cancer's favorite fuel against it

Cancer cells have a voracious appetite for sugar—using it to fuel their rapid growth. This is why many scientists have tried to develop drugs that block cancer cells' metabolism by cutting off their sugar supply.

French firefighters face 'pyrocumulonimbus' for first time

The gigantic wildfire ravaging southwestern France has created an extremely dangerous "pyrocumulonimbus"—a phenomenon never before seen in the country—the spokesman for the country's National Firefighters Federation of France ...