Fog is a thick cloud of tiny water droplets near the ground that makes it hard to see far. It often forms when warm, moist air cools down quickly.
“Fog” comes from a Scandinavian source, related to Norwegian “fogge,” meaning “spray” or “drizzle.” It has long described low, blurry clouds close to the earth.
We talk about a “foggy mind” when we feel confused or sleepy, borrowing the image of the world being blurred. Our language treats clear thinking and clear weather as if they were the same kind of visibility.
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