1 ene 1955 año - polio vaccine
Descripción:
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/
Añadido al timeline:
fecha:
1 ene 1955 año
Ahora mismo
~ 70 years ago