[Kickass Conservative]

If someone went back in Time and changed something, he would be the only one aware of it.

[salmon76]

I just went back to the past and found out that Donald Trump won the 2020 election. Wait, why is Joe Biden president?

[frank ballenger]

If someone went back in Time and changed something, he would be the only one aware of it.

Good point and one of the most probable. Also we could hop in and out of various dimensions and it would be like time travel. I'll take the one where my wife and I have a good seat for the Trump Second Inaugural in 2021, watching the smiling new GOP House Speaker and Senate Majority Leader who replaced Mitch.

Although I gave up SF after actually writing about it, reviewing and interviewing for years and getting published, time travel is about my last holdout interest. I have probably thirty-five books on it (amazing there are that many) plus about 50 or more novels and collections of short fiction.

Short of direct help from above, time travel would be about the ultimate power one could have.

[Buttons12]

If someone went back in Time and changed something, he would be the only one aware of it.

Is that a problem?

[lizma2]

Saw an episode of Twilight Zone where woman go back in time to kill Hitler as an infant.

Found it!

https://www.youtube.com/watch?v=byIkAPRnWnU

[Secret Agent Man]

Possibly not.

If they made a change that prevented themselves from existing, nope...