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4 ore fa · Sofia Danova (1879–1946), Bulgarian teacher and philanthropist, first Bulgarian woman to graduate in mathematics. Christine Darden (born 1942), American aeronautical engineer who researches sonic booms. Geraldine Claudette Darden (born 1936), one of the first African-American women to earn a PhD in mathematics.
1 giorno fa · It is located in the Delaware Valley region, located in the southeastern part of the state. [a] As of the 2020 census, the population was 545,823 (As of 2022), [2] increasing by 7.1% from 498,886 in 2010. [3] The county seat is the Borough of West Chester. [4] Chester County was one of the three original Pennsylvania counties created by William ...
- August 24, 1682
