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Today's @GoogleDoodles celebrates Dr. Salk, who discovered & developed the 1st successful inactivated polio vaccine. http://t.co/KQ3BR1u9uz

MITOCW: Today's @GoogleDoodles celebrates Dr. Salk, who discovered & developed the 1st successful inactivated polio vaccine. http://t.co/KQ3BR1u9uz - 2014-10-29 00:35:08