Time travel question.?

No. If you went back and met these people for the first time, then came back here, if they then went and found the young you and made friends then that would change your history as you remember it now. You don't have to go back to remember an uncle that used to talk to you of strange things because this was your childhood.

Likewise they will have the memory of seeing you as you are today, then finding the young you and having a lifetime of memories right up to the point where you meet them again.

If you change the past it changes it for everyone. If anything it will be you who has the sudden realisation of a lifetime of memories as soon as you got back. Either that or you won't remember anything and they will have to fill you in.

Taking this process further; If you time travel a lot, you will have 'forgotten' most of the reasons for the current events as your memory of things will be different to what actually transpired.

You could find out that all old time travellers are mad !

No, that isn't correct. It doesn't work that way. For every break in the cycle of time, there is a paradox. You jumped because of some other paradox that occurred. Each paradox will consist of 2 events because A + B = C therefore,

C A U S E

A = You travel back 75 years (to meet these friends)

A F F E C T

B = You must travel back 75 years, again (to meet these friends)

C = The sum of both visits for having traveled back 75 years.

No, they would have aged 75 additional years while you didn't age more than the time it took for you to return to 2015. When you say, "they would have to live the many years waiting for the time to come that I met them back in the past and then returned in order for me to know them" that makes no sense. Assuming they know you are indeed a time traveler, they would know that they'd have to wait until their time and yours were the same in the present-- not the past. There are no paradoxes here; it's all very straightforward and simple. If I met Joe Soap back in 1960 and returned to 2015, Joe would have to wait 55 years to talk to me about what we did in the past. There are no complexities here.

Some years ago a professor from Oxford taught a time travel course at my college. His final exam was so complicated and twisted it would have given Mr. Spock a headache. This is time travel 101.

If you found a portal that carried you back to 1940 and you interacted, made friends, and did stuff different than you actually did, would you not be changing the present and the you now would be a different person in the same body?

If you did that and came back to now, would you not have 2 sets of memories? You would be ambidextrous so, yeah, you'll see them and they will say, 'You've stayed the same all these years!'

Your friends from 1940 might find you and meet you between the time you were born and the time you went back to 1940 and they'd know you, but you'd have to have come back from 1940 in order to know them .

Yes you are correct IF we are making the assumption that time is singular and tangent.. IE if we are assuming there is only ONE true timeline and if we are also assuming the people that you made friends with DID NOT interfere with your upbringing.. IE what would stop them from finding you as you were born and helping raising you? IF they didnt interfere but stayed away and once you came back forward in time and then went to where they are at and if they are still alive then for you it is instant change for them it took 75 years to see you again.... there are 4 or 5 Time travel theroies and yes this is one of the older ones.. single timeline theory.. there is also chaos, multi line, Single point, and Past only.... NONE OFT THEM have been established as anywhere near true becasue WE CANT KNOW... mathmatically chaos is the farthest along but cant be confirmed... Single point also has a good mathmatical base though but is often ignored by most people sans hard scientists.

You could be in touch with them anytime in the present, but they would have to wait at least until you are born to get in touch with you. But you wouldn't know them unless you meet after your trip. And if you meet earlier, that may alter the future and you may never take your trip. Too many paradoxes in backwards time travel I'm afraid.

Sounds right, but you cannot alter the future in a TRIP to the Past. You cannot do ANYTHING that would change the time of your trip to the past. You cannot "cut" your own timeline.---That would be paradoxical, and we cannot create a paradox.--it Just does not work.

It would open up all kinds of possibilities. I could ask you to go back and tell me what horse to put my money on. You could open a bank account and put in some money. That would be a bit of a windfall when you got back with all the interest.

First off, to travel backwards in time, you the individual must travel faster than the speed of light, but once you do that, you could potentially travel forward in time by traveling close to the speed of light, but not exceed the speed of light, but the affect of traveling close to the speed of light is that time on earth passes by as it always has, but for you the traveler at near light speeds, time passes much more slowly, in effect, 10 months of near light speed travel would approximate 10 years of time on earth.

You're not really traveling forward in time, you're merely delaying the passage of time relative to the passage of time on earth surface inhabitants.

One could theoretically go backwards in time relative to earth time, but to do so would require a large planet sized spacecraft that is capable of enough mass to bend time for it's would-be passengers while simultaneously traveling faster than the speed of light, it requires an object that would come close to becoming a space-borne high velocity worm-hole/black-hole "lite" object that would potentially suck a lot of space prone objects into it's vortex or velocity "wake" as it passes by other stationary or gravity sized objects.

Just the mere attempt to travel through space alone would require a thorough, lower speed "trial run" to identify potential collision path objects that could potentially strike the spacecraft at near light or faster than speed of light vessel speeds.

Of course everything I mentioned is based entirely on how time travel works when using E= MC2 as I understand it, I may have misjudged some aspects, but I still think to do either forward or backward in time would have highly unintended consequences regardless of whether or not you were prepared to wait for the technology to catch up with humanity within your lifetime, it may never happen as long as religious ignorance dominates the thinking of a vast majority of people.

As long as people are convinced that a man-made, (false authority) object which exists as a mental construct is more powerful than human imagination through trial & error scientific discovery, then time travel will remain a crudely portrayed theme in movies and only within the context of movies that deliberately create plot-lines that do not threaten the carte blanche currently enjoyed by most of the world's most popular religions.