1 gen 1796 anni - A Vaccine For Smallpox Was Made
Descrizione:
Who: Edward JennerWhat: He found out that people who had cowpox were immune to smallpox, so he tests his theory and tests it on a little boy who afters becomes immune to smallpox.
Why: Without this vaccine, many people would have died from it and our population would be very low.
Aggiunto al nastro di tempo:
Data:
1 gen 1796 anni
Adesso
~ 228 years ago
