The Webb telescope found that a far-off little red dot is the oldest known black hole, shrouded by gas that could help explain the ruby color.

Women face a small rise in fracture risk within 10 years of stopping therapy, suggesting the need for additional monitoring.

Golden apple snails can regrow full, functional eyes. Studying their genes may reveal how to repair human eye injuries.

A Kenyan site shows early hominids transported stone 13 kilometers for toolmaking as early as 2.6 million years ago.

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One exercise outperformed walking, resistance training and aerobic exercise in the treatment of sleep disorders such as insomnia.

In The Martians, journalist David Baron recounts scientific and public debate over purported intelligent life on the Red Planet.

Analysis of the hair used in a knotted device reveals the owner’s simple diet. That suggests commoners, not just the elite, kept records in Inca society.

Sea silk, once spun from endangered clams, may make a comeback — thanks to discarded fibers from a farmed species. The find could sustainably revive a fading art.

A warming climate is behind growing floods of glacier meltwater in Alaska’s capital. Scientists say it’s the new normal.

Aerosols, small particles in the atmosphere like salt and dust, may offset a third of human-caused climate warming, though their influence is fading.

An analysis of tooth enamel from animals that roamed the western United States about 150 million years ago, including (from left) Allosaurus, Apatosaurus, a herd of Diplodocus and two Camptosaurus, ...