Crash Course is a Youtube channel that I stumbled upon quite accidentally, but boy, was I happy that I did. Crash Course provides instructional videos about World History, Biology, English Literature, and Ecology.  Each Crash Course is broken up into smaller video topics. For example: World History has 42 videos that average about 12 minutes each.  This could be a great resource if you were looking at flipping your classroom.  Even if you are not, it would be a great resource to use in the classroom.  Above is a video about Ancient Egypt from the World History course.