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Record amounts of sargassum are floating in the Caribbean Sea and ending up on beaches from Puerto Rico to Guyana — but scientists aren't sure why there's so much of it in the first place.

In rare cases where users are vulnerable to psychological manipulation, chatbots consistently learn the best ways to exploit them, a new study has revealed.

For reasons still unknown, Earth's energy imbalance is rising much faster than models can account for. Now, scientists are calling for long-term investment in monitoring capability, so that they can make informed predictions about climate change.

The bizarre behavior had previously been observed in experimental settings and was thought to be a competitive attempt to escape from the rest of the group. But new research suggests a more cooperative motivation.

Germany's Wendelstein 7-X stellarator has set a new benchmark for fusion reactors, bringing commercial, near-limitless clean energy one step closer to reality.

A disposable, electronic "tattoo" that measures mental workload could be used to enhance safety in high-pressure jobs, researchers say.

The skull of a young woman found at a Copper Age cemetery in Iran has revealed evidence of cranial modification along with a serious traumatic injury.

Discover interesting facts about the origin of the human species and what makes us different from our ape cousins.

A set of dark streaks that regularly wind across the Martian surface are more likely to be formed by dust and wind than by water, a new artificial intelligence analysis has revealed.

A new analysis of ancient DNA reveals a previously unknown lineage of hunter-gatherers who lived in what is now Colombia.