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At the 11th hour, a bacteriologist at NIH was told to safety-test the new polio vaccine. Her name was Bernice Eddy. When she injected the vaccine into her monkeys, they fell paralyzed in their cages. Eddy realized that the virus in the vaccine was not dead as promised, but still alive and ready to multiply. It was time to sound the alarm. She sent pictures of the paralyzed monkeys to NIH's management and warned them of the upcoming tragedy. A debate erupted in the corridors of power. Was the polio vaccine really ready? Should the mass inoculation proceed on schedule?