tl;dr Gödel came up with an alternate model of the Universe but Einstein didn't like it. Gödel starved himself to death after Einstein died.
"If time travel is possible, he submitted, then time itself is impossible. A past that can be revisited has not really passed. And the fact that the actual universe is expanding, rather than rotating, is irrelevant. Time, like God, is either necessary or nothing; if it disappears in one possible universe, it is undermined in every possible universe, including our own."
In typical New Yorker fashion it assumes you have never heard of platonism, formal logic or 20th century physics but assumes you remember the future conjugations of regular latin verbs.
So true and so well put - And I love the New Yorker. If I use this phrase in the future should I attribute it to you (although "according to gumby" might not fly so well with my other New Yorker aficionados).
[+] The referenced Kliban cartoon seems quintessentially New Yorker Magazine material but as far as I know he never appeared in it.