When I was in school, having a film during class was a treat. Usually it was because the regular teacher was out, but sometimes films were used to augment curriculum.
These days, videos are a staple in our culture. YouTube has experienced logarithmic growth. Teaching methods also use video more as science, technology, engineering and math (STEM) concepts especially benefit from video. Videos are able to show an experiment that would take too long in one class period or are too dangerous to demonstrate.
I love the University of Nottingham videos on each of the elements in the Periodic Table. They are fun and offer examples of each element, their uses, and often a reaction. I also enjoy the Symphony of Science videos like "We Are Star Dust" by Neil DeGrasse Tyson that I've pinned with many other educational videos to my Cool Science Videos Pinterest board. Check it out and share some of your favorites.
If you're a teacher, I have Pinterest boards for Science Education, Science and Nature, Space and NASA, Robots, and Architecture and Design, to name a few. I use Pinterest as an online, visual filing system for cool websites, articles, concepts, and images. Stop by if you are exploring Pinterest and say hello.