How to make a time machine?

I heard it somewhere, but I can't remember where... but it boiled down to this:
The fact that time travel doesn't exist is reason enough to realize that it is impossible.
Pretty much, it boiled down to if traveling into the past was possible, then people would already be doing it from the future.

Some of the most 'realistic' theories/methods seem to point to the idea that a time machine would only be able to travel back as far as the point which the machine was first turned on. Making time travel into the past before the machine was invented impossible. Similar to the movie Primer.

 

if time travel was possible backwards and forwards then everything you did if you traveled into the past would only lead up to what happens in the future
there is no way to change history
example: i travel back in time to stop my dad getting shot if i did succeed then i would of had no motivation in the future to travel back in time to save him therefore i proclaim it is impossible to change history through time travel

 

i don't think history would change in this particular timeline (parallel universe)

i was actually going to point that out.
would'nt people from the future be here by now (you know since they may have figured out the answer)

 

i agree but they would probably be hiding themselves for their own protection

 

i assume you saw that family guy episode :3
or fringe :I

 

Future does not exist.There, done.

 

I can see into the future, therefore, you do not need one.