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I'm not convinced this sign which informs the skeptical that "the use of electric lighting is in no way harmful to to health, nor does it affect the soundness of sleep" was ever really posted by the light switch of an 1890's hotel, as sources on the internet claim.
But it is funny, and I think would make a good quilt block square or curtains.
Ah, the wonders of science. What will they invent next?