When something dies, a telltale radioactive signal ticks like a natural clock. Discovering it helped us solve all sorts of ...

Today in History for Oct. 13: In A.D. 54, Roman Emperor Claudius I died after being poisoned, apparently at the behest of his wife, Agrippina. In 1399, King Henry IV of England was crowned. He had ...

Astronomy news today is packed with discoveries about the Sun, including tiny solar loops and hidden engines that drive solar ...

Earth's climate has fluctuated between cold and warm periods for millions of years. During the so-called "lukewarm ...

For decades, forest, grasslands and other land ecosystems have collectively absorbed up to a third of the carbon dioxide we ...

The ocean holds gigantic amounts of carbon, much more than all land-based plants and soil. Scientists previously studied ...