"... imagine a time traveller journeying into the past to stop a disease from spreading – if the mission was successful, the time traveller would have no disease to go back in time to defeat."
"... the disease would still escape some other way, through a different route or by a different method, removing the paradox. Whatever the time traveller did, the disease wouldn't be stopped."
#timetravel #phisics #math
https://www.sciencealert.com/a-physicist-has-worked-out-the-math-that-makes-paradox-free-time-travel-plausible