Revolutionaries took the police office in Villa de Ayala, gathered the people and Torres Burgos read to the crowd the Plan of San Luis Potosí. At which occasion Otilio E. Montaño yelled "¡Abajo las Haciendas y Vivan los Pueblos!"
Dr. Simon Flexner announced at a meeting of the Rockefeller Institute the discovery of the cause of infantile paralysis, also known as poliomyelitis or polio.
It was a Saturday.
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