This video from NASA is not exactly about teaching technology. I am nonetheless fascinated and totally awe-inspired by it and I think you will be, too. This is about one of the most important pieces of technology ever built by mankind, the Hubble Space Telescope. And this video can certainly be used in the classroom for teaching purposes.
On two occasions the Hubble has been pointed for extended periods at tiny patches of sky that previsously showed no signs whatsover of celestial objects. The results astounded everyone. After watching it, see if you have a sense of the immensity and grandeur of creation, as I did. Enjoy!