Aliens are here to destroy Earth 
But first, we’re allowed to send a 1-page letter back in time to some historical figure, which will then create a new timeline + trajectory for our species.
For maximum positive impact, who should we contact and what should we tell them?
Is there anything in particular we might hope a longer-lived von Neumann would produce? Some project he was working on? Or is this just from the general sense that he did a ton of amazing stuff?
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