Diagnostic dilemma: Brain scans following a man's hospital visit for leg weakness revealed a surprising finding

'I never thought we'd see one alive': Elusive goblin shark captured on camera for the first time

'They are trying to tame nature': China is building the world's biggest dam in an earthquake-prone region of Tibet

'Political motivations' of Inca emperor led to the sacrifice of 3 children on a snow-capped volcano over 500 years ago, study suggests

An ancient piece of the moon found in Africa hints at a long-ago collision that turned the lunar surface molten

Atacama Desert’s center dried out 20 million years earlier than previously thought — before the Andes formed