1 янв 1955 г. - polio vaccine
Описание:
the polio vaccine changed thousands of lives, not only saving them, but helping them survive too. polio was a major problem in the 1950s, as it killed 3,145 people per year! that may not seem like much now, but it was a lot back then..https://www.historylearningsite.co.uk/inventions-and-discoveries-of-the-twentieth-century/inventions-1900-to-1990/
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Дата:
1 янв 1955 г.
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~ 70 г назад