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When a waiting world learned on April 12, 1955, that Jonas Salk had created a vaccine that could prevent poliomyelitis, he became a hero overnight. Jubilation erupted worldwide, with Salk as the focus. Born in a New York tenement, humble in manner, Salk had all the makings of a twentieth-century icon-a white knight in a white coat. In the wake of his achievement, he received a staggering number of awards, a Congressional Gold Medal, a Presidential Citation; for years his name ranked with Gandhi and Churchill on lists of the most revered people. And yet the one group whose adulation he craved-the scientific community-remained ominously silent.