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.
  • ShaggySnacksEnglish
    12·
    3 months ago

    If you eat a piece of cheese, you get to levitate for 10 seconds no more, no less. Doesn’t matter the size of the cheese or the type (this includes lactose free).