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.
  • imPastaSyndrome
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    2 months ago

    Complete eradication of STDs

    It’s little ones like this that have such insidious implications.
    Even without a evil genie rule… No stds.

    Which means that sex has no touching

    Or

    Everything is super fucked up - bacteria/viruses/fungi can no longer transfer from creature to creature through touch… I don’t have the knowledgebase to even imagine what the results of this would be but I think somewhat catastrophic…

    ±------+

    Also wood would be dense as fuck. Damn.