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But what if u changed somethingLink. Since when did science care about religion.
On time machines; It would be impossible to build a time machine to go back in to time to change/fix something. If you changed time, you wouldn't have the need to build a time machine, thus you couldnt go back to fix anything.
Everytime you lose your train of thought, that was you inventing a time machine, fixing the problem and no longer needing a time machine.
You just described the space time continuum here.
You can't go back to change what already happened, because then it will lead to events causing you to never had built that time machine in the first place.
but left ur self a blueprint to still build the time machine
and told ur past(or is it present at that point) self why u went back
so that he makes sure to build the time machine