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1 ene 1952 año - A Vaccine For Polio Was Developed

Descripción:

Who: Jonas Salk

What: He Develop a vaccine for polio and help many kids get vaccinated

Why:I chose this because many people woulkd have died to this dangurerus virus

Añadido al timeline:

Heath Science

ByNathan Vong
10 feb 2020
0
0
218

fecha:

1 ene 1952 año
Ahora mismo
~ 72 years ago
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