re: #81 Nyet

Or consider not changing anything at all, in order not to become a murderer of billions. See my #58.

Remember the premise of the TV series “7 days”? That or even smaller windows between origin of trip into the past and the vent to fix things, anything more would create an avalanche of dominos of unintended consequences (not that 7 days aren’t enough to rack up a lot of unintended consequences).