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The inability to think with numbers. Statistical innumeracy is the inability to think with numbers that represent uncertainties. Ignorance of risk, miscommunication of risk, and clouded thinking are forms of innumeracy. Like illiteracy, innumeracy is curable. Innumeracy is not simply a mental defect inside an unfortunate mind, but is in part produced by inadequate outside representations of numbers. Innumeracy can be cured from the outside.