Salk, father of polio vaccine, dies
Dr. Jonas Salk, who became the hero of a generation by developing a vaccine against crippling polio, died Friday of heart failure. He was 80. Salk entered...
Source: upi.com
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Dr. Jonas Salk, who became the hero of a generation by developing a vaccine against crippling polio, died Friday of heart failure. He was 80. Salk entered...