1 янв 1796 г. - A Vaccine For Smallpox Was Made
Описание:
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.
Добавлено на ленту времени:
Дата:
1 янв 1796 г.
Сейчас
~ 228 г назад
