Thoughtful Call-ins on the subject of Time Travel in RPG'S from - Jason of Nerd's RPG Variety Cast - Joe of Hindsightless podcast - Spencer of Keep off the Borderlands podcast - Kevin of The Redcaps podcast - They all talk about things I had no knowledge about so I have just had to Blag my way through this. Check out this useful YouTube video that covers methods of time travel depicted in many of the movies mentioned (far better than I have done) - https://youtu.be/d3zTfXvYZ9s - YouTube animation video that explains the events in the Primer movie -https://youtu.be/tUzy-xPf0MI