Did microbes ever live on Mars? Did an "elevator" help build Egypt’s first pyramid? Some signs pointed to yes this year, but confirmation is still needed.

Teams are starting to analyze data from the total solar eclipse to learn more about the sun’s corona, gravity waves and changes in Earth’s ionosphere.

Prevention, screening and treatment advances combined stopped 5.94 million deaths from cancer in the United States from 1975 through 2020.

3,000-year-old clay tablets show that some associations between emotion and parts of the body have remained the same for millennia.

Millions of other animals may have perished too, suggesting the die-off event might be one of the worst in modern times.

Now atop Jezero Crater, the robotic explorer found quartz indicative of habitable environments and possibly the oldest rocks yet seen in the solar system.

Earthquake data suggest that all or small patches of the inner core's surface may be swelling and contracting.

Most present-day humans carry a small amount of Neandertal DNA that can be traced back to a single period of interbreeding, two genetic analyses find.

Twenty years after the deadliest wave in recorded history, most oceans have warning systems and communities have learned how best to escape the danger.

As of early December, there have been nearly 60,000 confirmed and suspected cases in 20 countries and 60 deaths in 2024. Children have been particularly hard hit.

Studies suggest that semaglutide reduces heart attack and stroke and may curb addiction and more. Scientists reflect on the future of GLP-1 drugs beyond weight loss.

More than half of rural hospitals and more than one-third of urban hospitals did not offer labor and delivery services in 2022.