1 ene 1955 año - Polio Vaccine
Descripción:
Jonas Salk discovers the polio vaccine. Polio was a disease that killed, and permanently crippled people (often in childhood) around the world. Salk's discovery helped save countless lives and prevented huge amounts of suffering.
Añadido al timeline:
fecha:
1 ene 1955 año
Ahora mismo
~ 70 years ago
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