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Is it worth closing the lid on a toilet before flushing?
(lemmyrs.org)
This community is for people to ask questions they feel stupid for not knowing the answer or how to find the answer. "How do I not already know this?"
I just re-read your link it to see if it mentions where the sensors are; I'd assumed the sensors were outside the bowl since that's what people are interested in but it doesn't say.
The paper is available, but as a layman the "read full text" path just takes me in a circle.