Benchfly is a FREE video platform for sharing video tips, protocols, etc on common lab science practices. The Benchfly Blog is beautifully eclectic and while it contains some references to mature topics- it paints a compelling picture of the nature of science. The most recent blog post features The Scientific Talk Report Card. See image below. Might be cool to show high school students that even real lab scientists seek feedback on their presentations.
For an example of a Video Protocol, see Pouring an Agarose Gel.