"Common sense comes from experience, and kids need to fail as well as succeed in order to learn it. It's difficult to develop common sense when you spend a lot of time in your room where nothing much happens."

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Common sense is merely unaided intuition, and unaided intuition is reasoning performed in the absense of instruments and the tested knowledge of science. Common sense tells us that massive satellites cannot hang suspended 36,000 kilometers above the one point on the earth's surface, but they do.

— E. O. Wilson