Hank Green's SciShow. One of the videos that grabbed my attention as something that my friend and high school chemistry teacher Walter Perry would like is 3 Chemistry Experiments That Changed the World. You can watch the video below.
Applications for Education
The videos on Hank Green's SciShow could be good for sparking a student's curiosity about various topics in science. I know that I was intrigued by the biofilm video and had to check out some of the references to learn more about it.