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.