A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.

Squat rhinos lived in North America about 12 million years ago, congregating in huge, water-bound herds much like modern hippos.

Dubbed the “bone collector,” this caterpillar found on a Hawaiian island disguises itself while stalking spider webs for trapped insects to eat.

Hubble is still going strong 35 years after it was launched into space. Celebrate its anniversary with some out-of-this-world images.

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.

Societal upheaval can trigger uncertainty, which makes people susceptible to cognitive traps. Experts suggest some simple tools can help.

The first skeletal evidence of a gladiator show or execution involving an exotic animal comes from a Roman British man with bite marks from a lion.

Warming temperatures can ramp up the activity of methane-producing bacteria in wetland soils, adding to methane emissions.

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.

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

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

The phase I clinical trials showed stem cell transplants for Parkinson’s disease appear to be safe and might restore dopamine-producing brain cells.