The rule could be anything, as funny or as serious as you want. The universe will progress in a similar way that it has up until this point, unless your changed rule prevented it from doing so.

Some examples might be:

  • The invention of currency is not allowed.
  • Iron is slightly less stable.
  • The Ancient Greeks are able to cultivate Silphium, which does not go extinct now.
  • VitabytesDev@feddit.nl
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    1 month ago

    Making the speed of light infinite one hundred times larger and the speed of sound the current speed of light. No more blue/redshifting! Faster communication!