A new Astrobiology study suggests non biological processes may not fully explain organic molecules found by NASA’s Curiosity rover on Mars. Could ancient life be a possible answer?

China’s vast tree-planting drive around the Taklamakan Desert may be turning shifting sands into a carbon sink. But can ...

See beautiful orchids at a Smithsonian museum, test yourself on National Puzzle Day, hear music from around the globe or learn about the history of Spam.