During the first half of the twentieth century, epidemics of polio caused fear and panic, killing some who contracted the disease, leaving others with varying degrees of paralysis. The defeat of polio became a symbol of modern technology's ability to reduce human suffering. But while the story of polio may have seemed to end on April 12, 1956, when the Salk vaccine was declared a success, millions of people worldwide are polio survivors.In this dazzling...