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

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

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, ...

The hypothesis could extend the search for extraterrestrial life to include frigid planets with thin atmospheres and underground water.

Sun-powered fliers could use photophoretic forces to hover in the mesosphere, gathering data from a region off limits to planes and balloons.

Found in Splenda, sucralose reduces immunotherapy efficacy via its effects on the gut microbiome, but arginine supplements might counter the outcome.

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