PBS
Pbs Learning Media: Primitive Insects of the Congaree Swamp
In this video segment from NatureScene, observe dragonflies and mayflies near Cedar Creek at Congaree Swamp National Park. [5:25]
TeachEngineering
Teach Engineering: Dams
Through eight lessons, students are introduced to many facets of dams, including their basic components, the common types (all designed to resist strong forces), their primary benefits (electricity generation, water supply, flood...