"It is courage based on confidence, not daring, and it is confidence based on experience."
— Jonas Salk

January 1, 1970

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Philosophers from the United StatesNon-fiction authors from the United StatesInventorsMedical scientistsPhysicians from New York City
Original Language: English

Sources

On testing his vaccine against polio on himself, his wife, and his three sons (9 May 1955)