deaths
Julius Richard Petri, German microbiologist (born 1852)
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Julius Richard Petri
German microbiologist (1852–1921)
Julius Richard Petri was a German microbiologist who is generally credited with inventing the device known as the Petri dish, which is named after him, while working as assistant to bacteriologist Robert Koch.Source: Wikipedia (CC BY-SA)
December 20
Day of the year
December 20 is the 354th day of the year in the Gregorian calendar; 11 days remain until the end of the year.Source: Wikipedia (CC BY-SA)