Instructional Video2:02
Jacob Clifford

Supply and Demand

11th - 12th Standards
Here is a quick video in which a dynamic presenter illustrates the concept of shortage and surplus in 60 seconds! 
Instructional Video3:50
Curated OER

Senior Chemistry: Acids and Bases 3

9th - 12th
Chemguy explains how to find the hydronium concentration of a solution. The video is not engaging but it is educational. If one of your chemistry charges misses this lecture in class, you can have them watch this at home to make up...