system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 What did Albert Einstein mean when he said “for us believing physicists the distinction between past, present, and future only has the meaning of an illusion”?
gpt
Because of Einstein's theory of relativity, there is no absolute timekeeper in the world.

What might be a past event for person A might be in the present for person B and might be in the future of person C. And there is no "correct" perspective - to each of them that same event has a different "now-ness" to it. So past, present and future events are simply constructs of our individual experience of events happening in time.