The brainchild of a retired physics teacher, the Cassiopeia Project aims to make high definition science videos freely available to ‘anyone who wants them’. The videos are broadly divided into subject areas, including Biology, Chemistry and Physics., with a particular focus on space science and astronomy, and include a series of videos on relativity. The videos are all self-contained but also work as a narrative sequence and are embedded in a ‘science fiction/romance’ story, intended to give structure to the collection and to help teachers and educators with lesson planning. The videos can be downloaded as M4V files, in HD or standard definition and users are free to edit and repurpose the clips as they see fit. Full transcripts of each episode are also available to download.