This video explains how the early Greek mathematician Archimedes discovered the principle relating density, volume, and displacement of water. [3:01] Includes a brief quiz and a list of additional resources to explore.

Help the farmer clean up his animals so he can take their photos. Match the animals to their right-sized bath tools.

A map of England and Wales in AD 584 at the end of the conquest of the Britons by West Saxons under Ceawlin and Cutha. The map is color-coded to show the territories of the native Britons or Welsh, Angles, Saxons, Jutes, and the Scots...