SqoolTube is a video resource for K-8 teachers and students. Videos are categorized by: Social Studies, Science, Math, Spanish, Music, and more. Within the Science category you will find clips organized into 30 subgroups including matter, force & motion, animals, etc. You will find full episodes of Bill Nye, Magic School Bus, and many others. It looks like content is added on a regular basis- definitely worth adding to your science video bookmarks.