An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmuted into another element through a nuclear reaction.
Almost 40 years separate Shirley Ann Jackson's achievement, as the first African-American woman to earn a Ph.D. in theoretical high energy physics at Massachusetts Institute of Technology, and Jedidah Isler, the first African-American woman to receive a Ph.D. in Astrophysics from Yale.
R oger Arliner Young was the first African-American woman to receive a doctorate in zoology, after years of juggling research and teaching with the burden of caring for her invalid mother. Her story is one of grit and perseverance. Roger Arliner Young grew up in Burgettstown, Pennsylvania. In 1916, she entered Howard University. In 1921, she took her first science course, under Ernest Everett Just, a prominent black biologist and head of the zoology department at Howard.