During the age of dinosaurs, early mammals probably lacked the stripes and spots of their modern relatives, having uniformly dark, drab coats.

The puppets, unearthed in El Salvador, have movable heads, strange facial expressions and may have been dressed for ritual roles.

Earth’s core could contain helium from the early solar system. The noble gas tucks into gaps in iron crystals under high pressure and temperature.

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A quantum processor solved a problem in 20 minutes that would take a supercomputer millions of years. A supercomputer then did a part of it in about 2 hours.

Face bones unearthed in a cave suggest that members of our genus, Homo, reached northern Spain as early as 1.4 million years ago.

An abundance of data show that SSRIs, a class of drugs commonly used as antidepressants, are effective, though, like any drug, they have risks.

AI models are growing ever-more capable, accurate and impressive. The question of if they represent “general intelligence” is increasingly moot.

A study of nearly 38,000 adults shows that the number of kids correlates with coordination of brain regions’ activities — regardless of parents’ sex.

We’ve learned a lot about COVID-19 over the last five years, but big questions remain. Recent federal actions may hinder the disease’s management.

In the fifth episode of The Deep End, volunteers describe what it’s like to live with the stigma of depression and the treatments they seek for it.

Uranus radiates more energy than it gets from the sun, two new studies find — just as Jupiter, Saturn and Neptune do.