time travel without paradox

Naked Monkey asks Ben Cypress Joy

How is it possible for you to come back in time to visit us without violating causality? What if you kill your own great-to the nth grandmother?


Ben says

History is not a single line. It's actually a vastly braided tapestry, in which quantum uncertainty creates many divergences and mergings among the time tracks.

When I was sent back to your time, a new branch of history was created in which I appeared. The old track (in which I did not suddenly appear in 1997 in the plaza at curiosity junction), still exists, and in fact, I plan to return to it at a point immediately following the time I left.

We all exist simultaneously in many copies, on many tracks.

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