CK-12 Foundation
Ck 12: Geometry: Polygon Similarity Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide looks at similar polygons, scale factor (ratio), and triangle similarity.
TED Talks
Ted: Ted Ed: Is There a Limit to Technological Progress?
Many generations have felt they've reached the pinnacle of technological advancement. Yet, if you look back 100 years, the technologies we take for granted today would seem like impossible magic. So- will there be a point where we reach...
CK-12 Foundation
Ck 12: Biology: Evolution of Multicellular Life Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on the evolution of multicellular life.