Nobel Foundation — Public Domain, Wikimedia Commons 1937 South African-American virologist Max Theiler developed a successful vaccine against yellow fever, work for which he later won the Nobel Prize in Physiology or Medicine.
ScienceOn this day — April 28 in African history
Real events, births and milestones from Africa and the diaspora.
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Nobel Foundation — Public Domain, Wikimedia Commons 1937 
Public Domain, Wikimedia Commons 1924 Kenneth Kaunda, who led Zambia to independence and served as its first president for 27 years, was born in Chinsali, Northern Rhodesia.
Birth
Raafat — Public Domain, Wikimedia Commons 1946 Nour El-Sherif, one of Egypt's most celebrated film actors with several movies ranked among the top Egyptian films of all time, was born in Cairo.
Birth
Library of Congress — Public Domain, Wikimedia Commons 1936 Fuad I, the last Sultan and first King of Egypt and Sudan, died in Cairo after nearly two decades on the throne.
Death
Public Domain, Wikimedia Commons 1257 Shajar al-Durr, who briefly ruled Egypt as sultana and was the only woman to hold the Egyptian throne during the Islamic era, died in Cairo.
Death