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The very first requirement in a hospital is that it should do the sick no harm. I arrived at Scutari and found the wards killing men faster than the battles. Cholera. Typhus. Dysentery. All preventable with soap and ventilation. I brought soap. I brought data — careful records of cause of death, compared across wards, across seasons, across hospitals. The diagram spoke louder than any argument. The death rate fell from forty-two percent to two.