It reminded me how explaining a difficult concept to a novice and expert audience simultaneously requires deep conceptual knowledge, and how listening to such an explanation helps to build simultaneous conceptual and mechanical knowledge of a concept.

Often times a powerful video can simultaneously engage AND demotivate students by "inducing" curiosity, while also explaining the content that underlies the phenomena.

The Google Science Fair designed in such a way that students are inspired to turn their thoughts and ideas into a format that address a gap in the world, and thus, change it!