My money&#x27;s on 69.<p>Rudy Rucker had some interesting conversations with Gödel about a deterministic universe in which (because time is illusory) backward time travel exists: <a href="http:&#x2F;&#x2F;www.rudyrucker.com&#x2F;blog&#x2F;2012&#x2F;08&#x2F;01&#x2F;memories-of-kurt-godel&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.rudyrucker.com&#x2F;blog&#x2F;2012&#x2F;08&#x2F;01&#x2F;memories-of-kurt-g...</a>