If you can travel back to the past...

[Suentous PO]

It's called time paradox and yes, one change on the past, BIG effect in the future.

Even if you go back in past just to buy a hat or clothes, which is supposed to be worn by someone else.
And if that "someone else" didn't wear that supposed to be worn clothes at the exact time, that's where the paradox is born.

You never know, it could've been your fathers hat which your mother liked about your father.

There is no paradox if we live in an Everit-Wheeler model multiverse.
If that turns out to be true, then traveling to the past would create a seperate reality abscent from the world and timeline you left when you went to the "past".
This is one of those things that will probably be resolved/understood if/when we have a true unified theory instead of a seperate science dedicated to the quantum.
There are even more and stranger possibilities.

Lol you guys watch too much Sci-Fi.

Haven't owned a tv in years, and don't read scifi. I'm duel statted nerd/geek.