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.
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No more Pauli exclusion principle. I’m not smart enough to describe what that world would look like… which is exactly why I would do it.
I’m pretty sure that would result in all matter compacting down to a single point again…