LogicRiddle #1418
After Jo's hot shower, a heart appears on the steamy bathroom mirror. Nobody touched the glass while it was fogged, and Jo didn't draw it. How?
Hint: Think about who used the bathroom before Jo.
Answer
Someone drew it with a finger days earlier, and the skin oil left behind fogs differently.
The invisible oil from a fingertip changes how steam settles, so the old drawing shows up.
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