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 ...

Ankylosaur armor could likely withstand the impact of a high-speed car crash, the best-preserved dinosaur fossil on record has revealed. The fossil belonged to a nodosaur, a plant-eating dinosaur that ...