Across much of the world, loneliness increases from middle age to later years. That trend is reversed in the United States, a new study shows.

Rising global temperatures are driving the sharp decline in terrestrial water storage. This trend isn’t likely to change, scientists say.

Autism rates are higher than ever before, probably because of more expansive and sensitive diagnoses. Those numbers highlight the need for more support for people with autism.

An overlooked Antarctic water system could raise sea levels by more than 2 meters by 2300, computer simulations show.

An archaeological site in Germany suggests communal hunting and complex thinking emerged earlier in human evolution than once thought.

Satellite data reveal a link between the amount of black carbon in the atmosphere and rates of Antarctic sea ice loss in recent years.

While solitary black holes should be common, they are hard to find. The one in Sagittarius revealed itself when it passed in front of a dim background star, magnifying the star’s light and slowly ...

A blob of gas seen outside the Milky Way could be a type of starless, dark matter–dominated galaxy. Some scientists are skeptical.

No longer considered functionless, the “rediscovered” rete ovarii may be crucial for understanding “unexplainable” infertility and ovarian disorders.

As global temperatures rise, scientists debate the pros and cons of solar geoengineering, a strategy to cool Earth by reflecting sunlight into space.

Some question whether the pups are really dire wolves, or just genetically tweaked gray wolves. But the technology could be used to help at-risk animals.