Events
1977 - Scientists identify a previously unknown bacterium (Legionella pneumophila, above) as the cause of the mysterious Legionnaires’ disease.
Births
1856 - Daniel Hale Williams, African-American surgeon
1892 - Paul Rostock, German surgeon
1918 - Gustave Gingras, French Canadian physician
Deaths
1878 - Antoine César Becquerel, French physicist
1995 - Adolf Butenandt, German chemist and Nobel Prize laureate
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