time travel.

[billy]

i think as altezon does. the multiple time line theory but a slightly different.

if we travel in time we go to a new time line. when we go back we go back to a new time. after that we go back and forth along the two time lines that allow time travel.
A because in the first time people come to it from the past and
B in the second time line people travel from the future.
we actually only need three time lines.
this one to start from. one go back in and one to go forward from.

i say the other two because we know of no one going forward from here or coming back from anywhere else.

i also think if it is going to work it would have to be along the theory of spacial displacement. where a space from one place is swapped with the space of another.