1 янв 1955 г. - Polio Vaccine
Описание:
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.Добавлено на ленту времени:
Дата:
1 янв 1955 г.
Сейчас
~ 70 г назад