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If time machines are possible, why haven’t we built one?

I think a better question might be: if time travel is possible, then why haven't we been visited from the future yet?

I think a better question might be: if time travel is possible, then why haven't we been visited from the future yet?

How can you be sure we haven't been visited? It's not like a time traveller would walk up to you and say "Hi, I'm from the future!" Society has a habbit of either laughing at or locking up and medicating people who do things like that.

I have a theory about that. What if we have had time travellers from the future. And I don't mean an alien civilization. Take for a minute that all folklore and tall tales have in them a tiny grain of truth someplace within the story. Then think for a minute about mythology... A specific example (this came from a story I read once and would like to give credit to the author, so If any of you know who wrote it please let me know) A person well versed in the mythos of a certain culture could feasibly call themselves, for example, Thor...He carries a pistol, or as he refers to it a "hammer" knowing that this would likely be accepted. OK, throw in a few events where said hammer is fired BANG (flash) and its "returned" to his hand. and enemy drops dead before the warrior....legend of mjolnir is born and our time traveller has just created the very legend he is using as a cover.

Ok Im done with the sci-fi thing. Its far too late for this stuff.

Oh and as an added note, if a time traveller altered something in the past I believe we in the present would never know, It would be our known history. To us it never existed any other way