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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.

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.

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.

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

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

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.

Here's the latest on mpox, bird flu, dengue and other viral outbreaks that flared up this year.

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

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