If
there was only one timestream,
then paradoxes would
be possible and time
travel would have to
be impossible. But every
time you make a change
in the timestream, no
matter how slight, you
are creating another
timestream. (As far
as you are concerned,
it is the only timestream
because you can't get
back to the first one.)
... You aren't really
jumping through time,
that's an illusion;
what you are doing is
leaving one timestream
and jumping to —
no, creating —
another. The second
one is identical to
the one you have left,
including all of the
changes you have made
in it — up to
the instant of your
appearance. At that
moment you have changed
the second timestream
into a different timestream.
— David Gerrold
The Man Who Folded
Himself
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