system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If i were to use a random number generator, and then go back in time to just before i used it, would i then get the same number, or a different one?
gpt
Depends on whether you were using a true random number generator that derives its number from things like atmospheric measurement or a programmatic psuedo-random number generator.  A real random number generator would give you the same value post time travel because it's derived from natural events which, assuming causality holds up through time travel, would be the same. A psuedo-random number generator could give you a different number because the program isn't derived from anything which should be causaly linked. Interestingly, if this experiment were to be done, it would answer whether free will exists or not.