Dec 1 (Reuters) - More than half a millennium ago, Aztec warriors brandished a weapon called a macuahuitl, a wooden club with jagged obsidian blades embedded on its sides, to inflict gruesome wounds ...

Fossils in Chile have revealed a new dinosaur species with a spiked tail for stabbing and slicing. The new type of dinosaur named the Stegouros has a tail "resembling an Aztec war club, with seven ...