Inventions 2: The Impact This lesson is the second of a two-part series on technology and inventions. Students are introduced to the world of inventions and how their ongoing development continues to affect all aspects of living—in both good and potentially bad ways.
How's the Air Up There? Explore the structure of Earth's atmosphere and discover how aircraft are affected by differences in air density in the atmosphere.. http: //aviationnow.com/content/ncof/lo_elf07.h...
