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.
  • @wabafee
    link
    62 months ago

    Wonder what would be the advantages if it has mass?

    • @[email protected]
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      fedilink
      142 months ago

      The universe would have collapsed back into itself shortly after the big bang, which would avoid a lot of suffering.