More than 40,000 people are expected to attend the global climate change summit as questions swirl about the United States' ...

The largest bird on Earth is the ostrich, which can stand as tall as 9 feet and weigh between 220 and 350 pounds. Although ...

The nether world, the underground, has been a space of curiosity, myth and imagination, whether cast as Hell or as a site of ...

Since its inception on April 29, 1999, NASA's Earth Observatory (EO) has published over 18,000 image-driven stories, ...