In 1831, somewhere on Earth's surface, a portal to the underworld appeared. A massive volcano opened wide its jaws and belched forth so much ash and smoke that the skies dimmed, cooling the Northern ...

From a telescope network that spans much of the globe to a psychology study that spans 67 countries, here are the biggest ...

An area of Earth larger than India has transformed from ... driving poverty and leading to water shortages across the globe, according to a new UN report. The report, prepared under the United ...