Jonas Salk quote: It is courage based on confidence, not daring, and it...

It is courage based on confidence, not daring, and it is confidence based on experience.

Jonas Salk

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

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

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