This seems like something that should be true, but I think I remember seeing a Mythbusters episode where they decided it didn’t make a difference. That show was more about entertainment than science, so I wondered if there was a more rigorous study done? I’ve definitely seen splashes of water(?) come out from flushes so that alone seems to argue for closing lids.

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    101 year ago

    Just think about all those public restrooms with like 8 toilets in a small area, all of which have no lids (not like anyone would put them down anyway) and use those super high pressure flushing mechanisms!