My favorite time-travel version is still The Technicolor Time Machine by Harry Harrison. It does away with this by having a single timeline. And if you go to th

My favorite time-travel version is still The Technicolor Time Machine by Harry Harrison. It does away with this by having a single timeline. And if you go to the past, it means you were already there "originally". Related: https://en.wikipedia.org/wiki/Novikov_self-consistency_principle https://en.wikipedia.org/wiki/Novikov_self-consistency_princ...