Many teachers may already have heard about, or used, a Crash Course video for your classes. There are a large number of topics and subjects for older students that align with courses and content you are teaching. The videos are pretty fast-paced and really designed I think, to help with review or overview of a subject. They are engaging as well.
Some of the subjects covered include:
Anatomy, Astronomy, Biology, Chemistry, Economics, Computer Science, Government, Literature, Mythology, Psychology, Physics, U.S. History, World History and Study Skills.