LogicRiddle #1422
After a light snowfall, every roof on Pine Street is white except Mr. Grant's. The houses are identical, nobody cleared it, and the sun hasn't come out. Why?
Hint: Think about what's under Mr. Grant's roof.
Answer
His attic is poorly insulated, so heat leaking out melts the snow.
Warm air escaping through the roof melts snow that stays on well-insulated roofs.
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